Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce0b27a45777ffc1…

MALICIOUS

PDF

74.2 KB Created: 2021-02-12 09:48:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d2d7bc604e0445476287eea8b3560888 SHA-1: 8db709aec9dcf988200c8c32dae83b655d866be1 SHA-256: ce0b27a45777ffc15c9bd78ac7de9524c3a7662203ed6550a58c9d8d3c90947c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to exploit users via external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://bologen.ru/wix?keyword=hero+wars+guide+2020 PDF link annotation
    • http://fionainthefield.org/69678603127axx2m.pdfIn PDF document text
    • https://cdn.sqhk.co/gesimefav/ihcx1ha/vatalofubefafisefojilepe.pdfIn PDF document text
    • https://derigibi.weebly.com/uploads/1/3/4/4/134447264/3375738.pdfIn PDF document text
    • http://digitalliteracyinstitute.com/9426796021c7sgd.pdfIn PDF document text
    • http://keto-menu.online/50782114544p39lh.pdfIn PDF document text
    • http://copyrightnotice-ig.com/ski_safari_adventure_time_apk_mod_moneyetm0m.pdfIn PDF document text
    • http://fastpeysistem.online/lovedufamizifananob4lkd.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/jcPhjXM/2017.pdfIn PDF document text
    • https://cdn.sqhk.co/loxinesupiva/UzgjrUv/83574860533.pdfIn PDF document text
    • https://cdn.sqhk.co/lazogapuvo/0kooyp9/best_grilled_black_cod_recipes.pdfIn PDF document text
    • http://astropsychology.site/evli_kadn_etkilemenin_yollarvmnsc.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/iOsiehi/borumegasexewi.pdfIn PDF document text
    • https://juposuwidamad.weebly.com/uploads/1/3/1/4/131406248/8248369.pdfIn PDF document text
    • https://cdn.sqhk.co/zonakagud/Mgjhfih/auto_keyboard_presser_for_roblox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/advanced_micro_devices_earnings_report.pdfIn PDF document text
    • https://s3.amazonaws.com/sojenozap/vavemuwusivodulij.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/free_autotune_for_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/visiting_card_format_cdr.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_off0000e6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D9 5288 bytes
SHA-256: 2041e0af331d775e5477c1c426d40461fdb58bcf5846761f8aafe72591d1199c
font_01_sfnt_off0000f8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F0 10132 bytes
SHA-256: 6e034747b41bf6afbde9137d05bac5c264d94f3a2c5f4b0f064290b751b875d1

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