Malicious PDF — malware analysis report

Static analysis result for SHA-256 c94831a4a5857eb9…

MALICIOUS

PDF

76.5 KB Created: 2021-02-11 07:46:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8ca316d90189660ff8cd28d7d8337fa6 SHA-1: 6fb82d87a8f8facc36a93abbac1dce366f95da57 SHA-256: c94831a4a5857eb9442e6a1d2d6795060e96928ddc0b0871b1498cd2cfdb2ec3
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains a large number of external links to other PDFs hosted on various domains, many of which appear to be disposable or associated with link farms. This behavior, combined with the ClamAV detection and ML flagging, strongly suggests a malicious intent, likely for SEO manipulation or to distribute further malware. The 'SE_CALLBACK_LURE' heuristic also indicates potential phishing or scamming activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://jottigo.ru/123?utm_term=skulk+5e+stats PDF link annotation
    • https://rasetakewalufil.weebly.com/uploads/1/3/6/0/136086978/8382256.pdfIn PDF document text
    • https://wirosumarot.weebly.com/uploads/1/3/1/3/131398493/vufabowolozafig.pdfIn PDF document text
    • https://xubejuvanexog.weebly.com/uploads/1/3/5/3/135311054/rifexisukusuxop.pdfIn PDF document text
    • http://cccckkkkkdd.space/gefumesewuximiwetinf9lb.pdfIn PDF document text
    • https://migawireradafus.weebly.com/uploads/1/3/2/6/132695569/mexofenoru-nosovosokewem.pdfIn PDF document text
    • http://bigowet.xyz/denitozowolagiranivh4ttt.pdfIn PDF document text
    • http://hugertely.xyz/autocad_plant_3d_tutorialheplj.pdfIn PDF document text
    • http://alifan.store/48969790703c0tsu.pdfIn PDF document text
    • https://bomefojidog.weebly.com/uploads/1/3/2/6/132695402/9012104.pdfIn PDF document text
    • http://segwaywheelchair.ru/kuvalewebetipumevunovukgtki.pdfIn PDF document text
    • https://vowevabejera.weebly.com/uploads/1/3/0/7/130775986/5245442.pdfIn PDF document text
    • https://zibubelufi.weebly.com/uploads/1/3/4/5/134517595/latoguga.pdfIn PDF document text
    • https://sovevalejuwup.weebly.com/uploads/1/3/1/8/131858043/nafure-nawoka.pdfIn PDF document text
    • http://swiss-family.space/309906058656knzs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://girakes.rf.gd/vurifomep.pdfIn PDF document text
    • http://jatojitax.rf.gd/canonical_transformation_simple_harmonic_oscillator.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE028 4492 bytes
SHA-256: f435744f7a75e4fd63aa40238be63961b9b7c113e4db914d390e184fc85c69b9
font_01_sfnt_off0000ef6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6E 11608 bytes
SHA-256: dd7c6cfdb2912760938553ad0f714f953584c49855f3485b51200b549eff917f
font_02_sfnt_off000116ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EE 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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