Malicious PDF — malware analysis report

Static analysis result for SHA-256 279266da0748fbcc…

MALICIOUS

PDF

77.7 KB Created: 2021-03-20 01:50:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7d7f214523fe8a5fa2d5047b1a911483 SHA-1: 58a0d1d19cf2ebd9d203726b94e6b056cba27300 SHA-256: 279266da0748fbcc780f1435b92e3832c64b9d38cbab2d9f7c34bc128b22c28d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/wix?keyword=absolute+beginner%2527s+guide+to+c+free+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404292/normal_6008e19210573.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480758/normal_601359af4ad2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_60146eaa5d5e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452609/normal_60032693a14b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477649/normal_5fe97c6749e87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449001/normal_604d413c02e1b.pdfIn PDF document text
    • http://zarewubizeno.mywebcommunity.org/82472421379.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459320/normal_5fc833e33b0cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497395/normal_6036a196356f3.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/how_much_is_a_long_haired_dapple_dachshund.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://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_2447451ab83548d5862ba68122d910b2.pdf?index=trueIn PDF document text
    • https://efed9c07-4553-4484-a419-1b844d271aeb.filesusr.com/ugd/6f475a_b1116e462e724ab59bc786a015b99ff8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/52511291-6fdd-439d-b8b5-d5b13281af56/why_wont_pilot_light_stay_lit_on_furnace.pdfIn PDF document text
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_e48cad5c837544279a9fc4723258e38b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/957cb7a1-0018-406b-ae98-30c0c25cba64/29961075677.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71778235-4343-4f98-a0dd-d506e47f6817/fomufufaguda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca17bbf3-55d6-4fbd-b766-7c89e746da15/31243531531.pdfIn PDF document text
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_505fdb65e1db47138b83720b93b93721.pdf?index=trueIn PDF document text
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_5cf79901c7724d8193390dfdf10c6b4a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae5f5ae0-1192-4d1d-a25d-5162ddf4526f/swim_pro_voyager_pump_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f526710-d643-4333-beb0-2cde2ca46d7a/2010_sports_illustrated_swimsuit_cover_model.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_off0000e551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE551 5156 bytes
SHA-256: 5ce08e7caedeaf6574cd3f7cab95d2c3e9b130f75c6b10af6d652529baa6a3be
font_01_sfnt_off0000f6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E4 10704 bytes
SHA-256: 157d2fc6ee98e2ec217ce67c3a98ae1622323f54ddfd34c9959c070f6a8c9ff1
font_02_sfnt_off00011b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3C 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71