Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce4c63e1e0ee9d54…

MALICIOUS

PDF

76.9 KB Created: 2021-02-07 22:14:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 79b6405fe5ef7fd4bfacd0974c519cdf SHA-1: 6304e3c342fc0b779781dd82efba9a7f98c5f373 SHA-256: ce4c63e1e0ee9d549ecfafd6f3b98050c8f1885b3f7e3c6b2b06715c220a3daf
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation to drive traffic to malicious sites. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://druttle.ru/aws?utm_term=web+browser+definition+pdf PDF link annotation
    • https://cdn.sqhk.co/tubozejo/hgBjaXz/23117905417.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/fhijg5h/home_design_and_decor_shopping_promo_code.pdfIn PDF document text
    • http://olymptrade.buzz/nutoguwibudusokenafigof4m.pdfIn PDF document text
    • http://biggymstoe.com/migekalasule43ae.pdfIn PDF document text
    • https://cdn.sqhk.co/gapekozuwa/dfjYL2R/h._a._m._b._drags_host_hotel.pdfIn PDF document text
    • http://poverkavoda.website/fundamentals_of_drawing19xxv.pdfIn PDF document text
    • https://vadisasezex.weebly.com/uploads/1/3/1/1/131163908/435799.pdfIn PDF document text
    • https://cdn.sqhk.co/bugolajoxodu/iBk6Cid/shuddering_meaning_in_tagalog.pdfIn PDF document text
    • https://bowefolezoz.weebly.com/uploads/1/3/1/4/131407704/84ce4182.pdfIn PDF document text
    • https://jewafime.weebly.com/uploads/1/3/2/6/132681773/wogowabe_kipilazul_rekebapeba.pdfIn PDF document text
    • http://circus.market/experiencing_god_through_prayer1ts76.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/mefonevimimix/validity_test_spss.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/36946256967.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/subtracting_using_a_hundred_chart_worksheets.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_off0000f1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E4 5036 bytes
SHA-256: 2239fd33e97075e43d5f47b12d2ff7d200195dc086e5ec6ee45e4c9d646fb2a2
font_01_sfnt_off0001032b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032B 10556 bytes
SHA-256: c3856b3c0135bf29bbc351d24bd7e23944f36ed43370544218ac71c20fe6c864

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