Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7619fc8aa2e89f8…

MALICIOUS

PDF

77.9 KB Created: 2021-03-28 13:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 722b4ea96a0f96fc7837ce4e9ff1ac26 SHA-1: 701c44edb5b98395dc607f070021d945f20700b4 SHA-256: f7619fc8aa2e89f84161877957afbed52c97195a355c6124a610d4e65cee9371
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 0.9990

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://dafemum.ru/wix?keyword=can+you+buy+valtrex+online PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413125/normal_5fdf0edddc849.pdfIn PDF document text
    • http://ottics.ru/vafimolarokowolegowafosoxvdpmq.pdfIn PDF document text
    • https://moxitamun.weebly.com/uploads/1/3/4/0/134040854/d7c8219ea9.pdfIn PDF document text
    • http://dostafood.xyz/19171129300h8e2j.pdfIn PDF document text
    • https://ruxunomitebapat.weebly.com/uploads/1/3/1/6/131606858/9d5f4ae.pdfIn PDF document text
    • https://keninowe.weebly.com/uploads/1/3/4/6/134617270/zexezeva-wagezuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446930/normal_6041f4d4d4e80.pdfIn PDF document text
    • https://wimofitadaxota.weebly.com/uploads/1/3/4/3/134362004/nujiva.pdfIn PDF document text
    • https://vobudofokivelux.weebly.com/uploads/1/3/4/5/134599261/pokikenozujutod.pdfIn PDF document text
    • https://nililekekikare.weebly.com/uploads/1/3/0/7/130739967/1339651.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451542/normal_5fe6b083a3c91.pdfIn PDF document text
    • https://gimisezijumini.weebly.com/uploads/1/3/1/4/131453276/4294093.pdfIn PDF document text
    • http://erethiztzj.space/botox_aftercare_instructionsv8c52.pdfIn PDF document text
    • http://smartcreditscore.info/jusudafamwz9.pdfIn PDF document text
    • https://wagezulixi.weebly.com/uploads/1/3/2/6/132695300/gusodivulon_sosadaxaf_bivid_woxuzo.pdfIn PDF document text
    • http://xtina.online/3990358880442qpq.pdfIn PDF document text
    • https://wenabavur.weebly.com/uploads/1/3/1/3/131379405/ddfa2be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366384/normal_5fd7ba5adb749.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_84324db884f2442f8c0b88327f195f95.pdf?index=trueIn PDF document text
    • https://9b704b87-3668-414c-a24e-b30400fe0e33.filesusr.com/ugd/51c472_57d6712230e545f980aa71c182238018.pdf?index=trueIn PDF document text
    • https://318abaa7-a496-4882-a5ef-186b1d719b20.filesusr.com/ugd/ff2e65_4c6eaab30a9e4cdcaa16121f08d79a69.pdf?index=trueIn PDF document text
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_5e338d60e1b24dcb8ccf0a5ec46a5b41.pdf?index=trueIn PDF document text
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_4a65af86b9674c1bbbcc017eb75f28fe.pdf?index=trueIn PDF document text
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_e2276bd338604dabae826fb9264bd03c.pdf?index=trueIn PDF document text
    • https://849bdae7-2456-4570-9e2a-fc769e7e49ad.filesusr.com/ugd/2074c9_f517c17f64d641239179d141e5bd4554.pdf?index=trueIn 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_off0000f417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF417 4776 bytes
SHA-256: 2f84180816a3113153c7a14ca3abfa897cb6d9fc336db3e90a24cf6d7c3ab084
font_01_sfnt_off00010470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10470 10948 bytes
SHA-256: e7ffc2a481b184f5fdb76ca66f21ef8cd198df995a6f4da2eaa172bb557dfa75