Malicious PDF — malware analysis report

Static analysis result for SHA-256 908247619c5b7eb7…

MALICIOUS

PDF

54.3 KB Created: 2020-05-05 01:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 8d651206ab47b86cdcb89f6869e3f95b SHA-1: 81bed40430147da8b61c6d718ead36fdb9806e93 SHA-256: 908247619c5b7eb7aafe4557adcf04a238c782a14903ea10f2f097b1c73b7242
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass external link farm, with multiple URLs pointing to seemingly unrelated domains. The document body, though partially corrupted, contains elements suggesting urgency ('account will be terminated', 'action required within 24 hours') and a callback lure ('call a phone number'). The primary heuristic indicates a link farm designed to host numerous PDF files, likely for SEO poisoning or to distribute malicious content. The presence of multiple external URIs suggests the document's main purpose is to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • 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.
  • 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 http://sfbaytherapist.com/uploads/1/3/1/8/131856382/131856382.html#windows+10+enterprise+e5 PDF link annotation
    • http://ingascustomcookies.com/uploads/1/3/1/4/131454522/8674744.pdfIn PDF document text
    • http://milkandhoney.care/uploads/1/3/1/3/131383998/8382896.pdfIn PDF document text
    • http://oikosfamilycentres.com/uploads/1/3/0/6/130620677/127d62a921b4b8.pdfIn PDF document text
    • http://royalflorals.com/uploads/1/3/1/4/131408917/2607593.pdfIn PDF document text
    • http://maya-lava-java.net/uploads/1/3/0/9/130968962/bopewazad.pdfIn PDF document text
    • http://fatuglybaby.com/uploads/1/3/0/3/130313741/lodalologelas-nifuf-joruxujivuvo-pebasonoponoxeb.pdfIn PDF document text
    • http://pipyritinsure.com/uploads/1/3/0/6/130640183/fufuzofuvabezu.pdfIn PDF document text
    • http://realestatecanopy.com/uploads/1/3/0/5/130588787/dexebatuk-zuxamepogon.pdfIn PDF document text
    • http://progressivelies.com/uploads/1/3/1/0/131070506/fexisuselafukipiz.pdfIn PDF document text
    • http://schaubsocial.com/uploads/1/3/0/5/130551621/fodavole-wuberisov.pdfIn PDF document text
    • http://howwelive.de/uploads/1/3/1/8/131856029/zofuba.pdfIn PDF document text
    • http://slharvestclassic.com/uploads/1/3/0/4/130488395/13ddc3f.pdfIn PDF document text
    • http://yockerz.com/uploads/1/3/0/6/130605168/5356623.pdfIn PDF document text
    • http://sbingman.com/uploads/1/3/0/9/130969414/0ebf160.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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/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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9293 10896 bytes
SHA-256: 0c5adeb63b2c258f7d2aac8a2866e277b7f2484b45a71d5f1328961b173433ca
font_01_sfnt_off0000b81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB81F 16140 bytes
SHA-256: 3f83bbfb2e03141a9083badfb1da6e2b1773f9aa6b1ed8f30fc2d392a5ee3553

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