Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cfecb1f94ed26c7…

MALICIOUS

PDF

80.9 KB Created: 2021-03-24 18:55:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 032fe3869bc3688cae1c7e87dd8a1655 SHA-1: 0343b7edf19d7213b1dbf7970969152015930077 SHA-256: 2cfecb1f94ed26c77b01121736fa763fd85c27c3110c59ed2853a6bb5c8b4783
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with a primary URL pointing to a site offering cracked software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and embedded URIs suggest a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wix?keyword=pi+music+player+apk+cracked PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490370/normal_5fd67dfb3bcd1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460680/normal_5ff4a197ae59c.pdfIn PDF document text
    • https://pexasuwen.weebly.com/uploads/1/3/4/5/134593650/765581f3809.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415531/normal_5fd8fac43482b.pdfIn PDF document text
    • https://zapodebas.weebly.com/uploads/1/3/1/4/131437158/d5b9659.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527345/normal_6038792b04cc3.pdfIn PDF document text
    • https://baduzizexajozej.weebly.com/uploads/1/3/4/6/134653824/maxobasezidixiv-raxifutipup-joxelawi-fuxivatomekalel.pdfIn PDF document text
    • https://kegorobaz.weebly.com/uploads/1/3/5/9/135963119/demovone.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://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_db5f5940bd6440b4a8ea943a5720e67e.pdf?index=trueIn PDF document text
    • https://2cc12256-1025-444a-bacb-901a9f007bda.filesusr.com/ugd/d1fcfc_e5c9a3b662b14159ad3134383af19057.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/11defe5d-c788-4083-a481-c06efcf90bac/uncommon_genetic_traits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2c33928-a2a6-4bb1-9a5e-2605a3e47eaf/lomuza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b99ba40-773b-4dc6-bca0-e58810a1bea0/69600566855.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7618f70f-ce4a-4e19-9e21-bdb171921dd6/what_is_routing_in_mvc_interview_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8eb9b7af-7925-400c-b729-c270968708c1/sharp_20l_microwave_oven_shp-r207ek_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ce14d4b-3913-499c-9c13-9f5adf52e648/how_to_start_an_online_business_uk.pdfIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_8b68f2ef75944cd29be806ac726325a4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/75beff13-69d7-4b61-8e9c-23e9e8676552/what_is_the_next_book_after_diary_of_a_wimpy_kid_wrecking_ball.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d924b320-266c-48d1-b9a2-39cdccb31248/vewakiri.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_off0000f38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38E 4972 bytes
SHA-256: 8271cc65955fe78f8e4133bb15d4747db61ba0b875fabaeb1d7c9c411edaa22a
font_01_sfnt_off00010470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10470 10356 bytes
SHA-256: 225615ed51c77af4543d0958ced0506229466ec5b7173fe8c14861a77c899b36
font_02_sfnt_off000127f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F3 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e