Malicious PDF — malware analysis report

Static analysis result for SHA-256 23e5943249e71f0a…

MALICIOUS

PDF

67.7 KB Created: 2020-12-07 11:07:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 8651853615f094ba81609e3187d2ea8b SHA-1: 17a27c2728464942dfcc4f1fcbf5fc6ebb65f4ee SHA-256: 23e5943249e71f0a9eb40f96a6953b1656c2f78f999a419e933effea5f1d6c49
264 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, many pointing to disposable hosting, and one critical link to a known malicious redirector. The document's structure and embedded links suggest it is part of a link farm designed to distribute malware or conduct phishing attacks. The presence of a callback lure heuristic further supports a phishing or scam-related intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://traffine.ru/123?utm_term=blue+ember+grill+recall In PDF document text
    • https://geserani.weebly.com/uploads/1/3/4/3/134347405/zitamamawogam.pdfIn PDF document text
    • https://jarofuzaduse.weebly.com/uploads/1/3/4/5/134502270/535bd29bacf.pdfIn PDF document text
    • https://tipiridevozono.weebly.com/uploads/1/3/4/3/134349557/1722602.pdfIn PDF document text
    • https://tapidokebijimub.weebly.com/uploads/1/3/4/5/134577153/rinaterobafadizi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401711/normal_5fbe2f31ef706.pdfIn PDF document text
    • https://zefufewik.weebly.com/uploads/1/3/4/3/134374544/puledotusuw_muwepolaxiwali_zepevubivun.pdfIn PDF document text
    • https://niraniki.weebly.com/uploads/1/3/4/6/134662237/a027c1b2fef.pdfIn PDF document text
    • https://lolisusije.weebly.com/uploads/1/3/4/6/134627287/mofelosoz.pdfIn PDF document text
    • https://siziloxa.weebly.com/uploads/1/3/4/7/134747516/c2b07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464724/normal_5fb9c6dcc0eb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412778/normal_5fc0ef4922f0c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc5226be5c7695ca9b6fdef/t/5fc700f16beae454315b3b23/1606877426442/bullet_force_multiplayer_hack_pc.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc19ddc2bbd7406580b9f20/t/5fcc8331978da30c56f71e20/1607238451395/67440711628.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_off0000ccfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFC 5128 bytes
SHA-256: 69fb0a5c9b66ff7ba69701ead80a1ab4b12e3362d212cb6ebeeeff3541a21841
font_01_sfnt_off0000de58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE58 10496 bytes
SHA-256: b1d8f710618544828864f1bf2263ad1fba9a5cd7362ce3b8449a36eac50ce1f1

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