Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55d19bcda45e299…

MALICIOUS

PDF

96.6 KB Created: 2021-06-13 16:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 78da240e5bc53f55c2d431f88edbd0c4 SHA-1: 190f2583829aa25f3d043fff5c6d1df66a5229fe SHA-256: e55d19bcda45e299872656f20ece90c72cb5fb0b12e7d8205fe427f5636ae2b2
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/pbw?utm_term=mapla+birthday+wishes+in+tamil PDF link annotation
    • https://dapinolun.weebly.com/uploads/1/3/4/7/134762022/1e3c7.pdfIn PDF document text
    • https://sorudexene.weebly.com/uploads/1/3/1/3/131384015/zagomeroz-givazokejesovu-walumib.pdfIn PDF document text
    • https://lupagizan.weebly.com/uploads/1/3/1/6/131637074/0e2fab4def161f.pdfIn PDF document text
    • https://zuvagenujak.weebly.com/uploads/1/3/4/4/134454716/8336913.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464869/normal_603cb68d8c515.pdfIn PDF document text
    • https://barijenevedi.weebly.com/uploads/1/3/1/4/131438420/66ce6cbac3dcdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476590/normal_606812d233dd5.pdfIn PDF document text
    • https://nebofubegifeso.weebly.com/uploads/1/3/1/4/131437549/fedilaje.pdfIn PDF document text
    • https://xobagesimijuvu.weebly.com/uploads/1/3/0/7/130776740/fulutusowewokebovap.pdfIn PDF document text
    • https://koralazuvumo.weebly.com/uploads/1/3/1/8/131871516/4862247.pdfIn PDF document text
    • https://kixovojowabib.weebly.com/uploads/1/3/5/9/135966002/3233837.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e6e5541-8c98-4db8-85bf-00ac4072929a/bushnell_neo_xs_firmware.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a9233bb-3306-49fe-9cf1-ea87ffff1c98/23816431981.pdfIn PDF document text
    • http://zizojeza.pbworks.com/w/file/fetch/145161621/27148082770.pdfIn PDF document text
    • http://liguduper.pbworks.com/w/file/fetch/145166919/unit_7_level_e_choosing_the_right_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/684d945a-29e4-4dfa-99c2-79b33d094aaf/jidakejirikaka.pdfIn PDF document text
    • http://funinupun.pbworks.com/f/super_smash_bros_iso_gamecube.pdfIn PDF document text
    • http://japomajuxire.pbworks.com/w/file/fetch/144442653/pogisutidana.pdfIn PDF document text
    • http://gefudodi.pbworks.com/f/how_to_remove_icloud_activation_lock_iphone_5c.pdfIn PDF document text
    • http://katafuzum.pbworks.com/w/file/fetch/144482970/hotel_del_luna_music_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f431014-82e9-470d-8a71-11e85717fe23/kamelaxina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/157f589c-a7e1-48bc-8fec-74ab05b82a30/why_does_harry_have_to_hide_the_half_blood_prince_book.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010e22.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10E22 20796 bytes
SHA-256: e5538bf0525801c2fc9be9e4c18e7b366d30f0254916b50867a5c126608f172e
font_00_sfnt_off0000fb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB66 5536 bytes
SHA-256: 0517aca52b56b6551d7ac99170e1d5a614cd22f594410b33a3331d1339a38ee6
font_02_sfnt_off00013a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A5B 7532 bytes
SHA-256: f1f4bbb0ec2aadeffe88ff1fdb03d4b57cc679631fdd96f15410ee502528fa88
font_03_sfnt_off00015175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15175 9996 bytes
SHA-256: 62ac782c08b270d52d7f9300e1ebebb1e5cb4d65312c63d96cf701ea53ec57de

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