Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7def20cdb0c3fe8…

MALICIOUS

PDF

83.9 KB Created: 2021-03-09 00:03:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3eed31463477e3ce74b0bd199f67410a SHA-1: 5b6dec7f72a575a878b683605b6e62f3122fb4fd SHA-256: c7def20cdb0c3fe8c97120b3ae9c189d9586f7ee00471b94ecde6a39d5bc1086
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, with a significant portion pointing to disposable hosting, indicating a link farm for SEO manipulation or phishing. The primary malicious URL identified is 'https://xajibur.ru/wix?keyword=punnett+square+worksheet+2+answer+key', which is likely used to distribute further malicious content or phish for credentials. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://xajibur.ru/wix?keyword=punnett+square+worksheet+2+answer+key PDF link annotation
    • https://kewejalafu.weebly.com/uploads/1/3/5/3/135329801/zevexelumez-zenagu-zarinijap.pdfIn PDF document text
    • https://nibawomufexax.weebly.com/uploads/1/3/4/3/134371272/9851600.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5ea519a1-95f6-4c85-93ac-3dcaa6606723/cfa_level_1_june_2020_curriculum.pdfIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_1226a6e9dde04cb78fcaedfbd40be74d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa8ff47a-def1-4d6f-a343-4b5503df68cd/troy-bilt_storm_2410_2-stage_electric_start_snow_blower.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/389e3ee4-2b6a-4ede-869a-c28c5ac5998b/pijabovodozegiwunosefo.pdfIn PDF document text
    • https://12f7643e-9106-4823-89c2-0bdaecd1bc22.filesusr.com/ugd/1f6d71_855bde1d370a4752bee40ae5f05219f2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/31c0b487-fd9d-4ce9-afc4-d190a5480743/snapper_1030_snowblower_parts_diagram.pdfIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_3013640a119b49d9ac13abf7261a3809.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0530dc85-5fbf-4b97-9991-033d912c0f31/how_to_edit_vertical_video_imovie_on_iphone.pdfIn PDF document text
    • https://1138278f-e8d0-45ef-aef3-dbdd7428ac52.filesusr.com/ugd/5be868_9529a4f0274c4992ae93c4e8fad01b4d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d2c61af-4476-4fb0-91ce-6de287262065/braun_thermoscan_lens_filters_-_40ct.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a16b7fd0-b7c9-42c2-96e9-ae27aea71276/best_fly_tying_materials_website.pdfIn PDF document text
    • http://kekarizirisa.rf.gd/five_senses_worksheets_for_toddlers.pdfIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_4fcc8d2ba3764d6cb5e96790319c3378.pdf?index=trueIn PDF document text
    • https://bac325b5-3710-4a60-ba01-c1ac5e8a7650.filesusr.com/ugd/c111de_ff4e6d725f694d2497b675bb8a9578d6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/770a0031-9dcc-458d-ab95-8257f904b675/how_to_improve_bjj_at_home.pdfIn PDF document text
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_f04f5b016c8849d1b0fc6888d4af82d3.pdf?index=trueIn PDF document text
    • http://tuxizosog.rf.gd/yarrawonga_ski_club_gig_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24e38dff-c435-406b-92d8-6fb72b02a5c3/vutujuvoreveretotezatejup.pdfIn PDF document text
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_a9d12ec1f7c143a1817b19a634078860.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f3b6389-4065-4f37-9c9b-b330a9d89876/80941196467.pdfIn PDF document text
    • http://zividovapajawuv.epizy.com/xisuzirejobifisinufol.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE87 5092 bytes
SHA-256: acaf5f69e7e975ff292cd72ac5ed4e1987c63843c4a4b7765ca26045d07bffba
font_01_sfnt_off00010fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE2 10552 bytes
SHA-256: aa7e90bef73921780b947012c5a3f387d80cd4156fc6a26a8060b1d83656ec7d
font_02_sfnt_off000133f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F6 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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