Malicious PDF — malware analysis report

Static analysis result for SHA-256 5522acb206740dc7…

MALICIOUS

PDF

81.3 KB Created: 2021-06-11 04:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 091dee6d2909839673c216ae9b761a99 SHA-1: 3e2488c60dbfc447843cd4a6fe0cb5de0a9abbb7 SHA-256: 5522acb206740dc7563a95e430c4993d31240940ef9741e23600af21693607cd
206 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms and phishing. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of embedded URLs and the heuristic 'SE_CALLBACK_LURE' suggest the document is designed to direct users to malicious sites or engage them in a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://allytemp.ru/pbw?utm_term=gita+book+bengali+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424007/normal_602c16e27aa84.pdfIn PDF document text
    • https://kexexetipo.weebly.com/uploads/1/3/4/8/134897314/52f5cef.pdfIn PDF document text
    • https://lidalukedewad.weebly.com/uploads/1/3/4/6/134664428/59616fd8172eb.pdfIn PDF document text
    • https://befomunuduti.weebly.com/uploads/1/3/1/1/131164266/tukozufavoz-sebetasadoku-tanisojexivev.pdfIn PDF document text
    • https://gomarevijupa.weebly.com/uploads/1/3/4/5/134585171/wewafek.pdfIn PDF document text
    • https://jarurozo.weebly.com/uploads/1/3/5/3/135320013/bfb696c9c.pdfIn PDF document text
    • https://wigabededonekan.weebly.com/uploads/1/3/0/7/130740374/tatapaj_pewidosifotu.pdfIn PDF document text
    • https://jamibubobew.weebly.com/uploads/1/3/5/3/135322635/6a5499.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452863/normal_60bde567b1231.pdfIn PDF document text
    • https://boxuxalido.weebly.com/uploads/1/3/0/8/130814411/4dd77cd517df.pdfIn PDF document text
    • https://duzopotubesafes.weebly.com/uploads/1/3/4/8/134890215/2488322.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367289/normal_5fdef22c3ce87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467298/normal_5ff81d10c4ac7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xesimisejek.pbworks.com/w/file/fetch/145092327/donejivopililo.pdfIn PDF document text
    • http://munonoraze.pbworks.com/w/file/fetch/144641217/36935378452.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea5b629d-5952-4228-9b4b-b47dead781c1/kotekomirasajavekob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04c69854-2927-41cb-b846-45a1b7d4e191/97893183286.pdfIn PDF document text
    • http://luwapoveduvi.pbworks.com/w/file/fetch/144507558/81631691557.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AB 5172 bytes
SHA-256: c2832589d5268577e8541b824baab3cc7f83075c26dd58a13f876f7966c62ee5
font_01_sfnt_off0000e45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45C 7940 bytes
SHA-256: e1866ee8315e46446d2cfc374c14b000aebb8fee9afc3618fa92cefe70b3338f
font_02_sfnt_off0000fcd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD0 10696 bytes
SHA-256: ff094dd197a57c11dfb35b3eed9679ea231374dc586d8401f2f9385e2435ef90
font_03_sfnt_off000121de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DE 16164 bytes
SHA-256: 4bd16c8abd39118228c1571b0005d4eb3b3e943e572fd92a2a80cfcb7b749349

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