Malicious PDF — malware analysis report

Static analysis result for SHA-256 857524088c9ae46d…

MALICIOUS

PDF

73.6 KB Created: 2021-05-26 06:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 87b9c9e29f1e61ad0d4b1469381e4aec SHA-1: 8f6e4f3b74796296947a843f0cf9812eb90dcfc3 SHA-256: 857524088c9ae46daaccbade54fd08c0159891d5f8e7101ac3217232111a76df
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/wb?keyword=blank%20venn%20diagram%20template%20word PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422382/normal_602e6f0296cc9.pdfIn PDF document text
    • https://pajejasebuwosiw.weebly.com/uploads/1/3/0/8/130813778/melanemava.pdfIn PDF document text
    • https://lazidejapagopi.weebly.com/uploads/1/3/4/8/134891766/129431b0c3d3c91.pdfIn PDF document text
    • https://rofajubufilotol.weebly.com/uploads/1/3/1/3/131384128/lalidalalikixav-wofev-radike.pdfIn PDF document text
    • https://totaguzoxexidi.weebly.com/uploads/1/3/2/7/132741029/8192208.pdfIn PDF document text
    • https://gowapatemik.weebly.com/uploads/1/3/5/3/135319450/4675045.pdfIn PDF document text
    • https://lapokatodulobak.weebly.com/uploads/1/3/5/3/135347459/dumekex.pdfIn PDF document text
    • https://vafukomoruf.weebly.com/uploads/1/3/4/8/134862603/fefepuxotaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501229/normal_5ff026fd44b54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378628/normal_604fc4150ba24.pdfIn PDF document text
    • https://tasagimaxo.weebly.com/uploads/1/3/0/8/130813305/c2448e.pdfIn 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/e7300b88-f74d-4c6e-953c-b58c948b4c29/panasonic_cordless_phone_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/29721677780.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/292bae15-4971-4519-9330-5d598c5a92cf/xedipajovef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db81f4d1-81d9-4675-bfaa-f4b9daaa2165/my_samsung_note_5_will_not_turn_on.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/install_ezdrummer_2_crack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e85be2a1-cece-4846-874d-cc68a227c6a1/31596782008.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/32550894351.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/vipetovigipavako.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03d50676-45d9-48cb-8933-8fad5cb80b36/how_to_identify_a_page_break.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c926c98c-f5f3-478d-8db0-edab8191eafc/biwixajokipaganosunud.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15C 5368 bytes
SHA-256: 05273e89882cc1cd5a57226e6b586496618fdd3e6dae81f5e42bf2c567af9e41
font_01_sfnt_off0000f39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39D 10496 bytes
SHA-256: ccccf3408ab2c4c917606ec6e412b59bf705581bb6aa0799bbf43bd7a294bb3d