Malicious PDF — malware analysis report

Static analysis result for SHA-256 910cc969522b9aa7…

MALICIOUS

PDF

82.0 KB Created: 2021-05-12 11:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a3242f306dd4bc597f03cdb4755dd4f4 SHA-1: 35c1662eb8b4efab7d605eae0d3a53bf65da5be7 SHA-256: 910cc969522b9aa725e4d16e420efc228c25565ec00fbba9c529da30635413af
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, flagged as a 'PDF_SEO_LINK_FARM'. While the document body is heavily corrupted, the presence of numerous links suggests an attempt to manipulate search engine results or redirect users to potentially malicious content. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://bufudelazevel.weebly.com/uploads/1/3/4/7/134734798/d8b1ceca4e67c.pdf In PDF document text
    • https://koxofekidoponu.weebly.com/uploads/1/3/3/9/133997415/rovonoxinovilavitine.pdfIn PDF document text
    • http://winatesef.sportsontheweb.net/35962838036.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384304/normal_602e72bb6ac33.pdfIn PDF document text
    • https://sijetuso.weebly.com/uploads/1/3/4/4/134499475/3232622.pdfIn PDF document text
    • https://didaripetog.weebly.com/uploads/1/3/4/6/134685212/5060520.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502567/normal_602bf7584eaf1.pdfIn PDF document text
    • https://lodarexuxune.weebly.com/uploads/1/3/4/3/134352809/jeguwililari-lubivesawido-ferema.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392209/normal_605922571b9d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460263/normal_5ff25fa5a0e50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376879/normal_604ede401b1a1.pdfIn PDF document text
    • https://jivoxixipilekok.weebly.com/uploads/1/3/4/8/134885045/debeniloreliror.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/B9wesDdUo4k/wb?keyword=what%20is%20the%20iliad%20all%20aboutPDF link annotation
    • https://s3.amazonaws.com/gurowozenupifi/59031100369.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/breakers_revenge_mame_rom.pdfIn PDF document text
    • http://dusameferadulo.onlinewebshop.net/midas_touch_free.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/rizarekezuwanifu.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/fnb_forex_pricing_guide_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/how_to_clean_coleman_roadtrip_grill.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/vuzidufokozexatasosofa.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_off0001068a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068A 4972 bytes
SHA-256: a2f707157c9d7e947221693c5964774eb528c5ab368aca3f9e94d515ffab88dd
font_01_sfnt_off00011774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11774 10496 bytes
SHA-256: 29bb9f7f491c0df459d9c600d14e4a7a71c9df1c6dc5e03e508776adb5121587

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