Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf35666dfd84e072…

MALICIOUS

PDF

68.7 KB Created: 2021-02-16 07:58:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 3fc66c72f6da076c29d1b36482484d41 SHA-1: 2b748da4ea6e368d18127beb12014d53f6ee696f SHA-256: cf35666dfd84e0725ab2caec0d1e8d57883bd6dcbba1c7c3aca0137ff506ed03
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains and Weebly-hosted files, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. ClamAV also detected this file as a phishing trojan. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious content or to improve search engine ranking for malicious sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=how+to+data+in+excel+graph In PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/Dghdjau/babylon_bee_twitter_suspended.pdfIn PDF document text
    • https://fugopezawisobib.weebly.com/uploads/1/3/1/3/131383650/7229085.pdfIn PDF document text
    • https://cdn.sqhk.co/gukokefa/hkjaiiI/bowery_bar_and_grill_new_york.pdfIn PDF document text
    • https://kukurako.weebly.com/uploads/1/3/5/3/135321284/gulazafav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408476/normal_6008c9d55221b.pdfIn PDF document text
    • https://cdn.sqhk.co/nenakowi/phbhhWF/badobufo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483873/normal_6025ab4e63066.pdfIn PDF document text
    • https://ripukalogud.weebly.com/uploads/1/3/4/3/134391837/8060539.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393208/normal_5fd819eb4a1b1.pdfIn PDF document text
    • https://taxurazuzar.weebly.com/uploads/1/3/4/0/134042721/8076216.pdfIn PDF document text
    • https://raligeledow.weebly.com/uploads/1/3/4/8/134893256/fakojetuwodujo.pdfIn PDF document text
    • http://wersita.space/dusagesuboqeniv.pdfIn PDF document text
    • https://xakalawuvobovu.weebly.com/uploads/1/3/1/0/131071286/7170139.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/bubeto/aneurisma_otak.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/nice_guidelines_urinary_tract_infection_2015.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/povovosevasuraganeta.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/acute_pancreatitis_guidelines_acg.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_off0000d33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33B 5280 bytes
SHA-256: 5121a5f8e5b52e2db10ea91c4c30d6965a34d39988a966386d000dee703a2259
font_01_sfnt_off0000e53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53A 9716 bytes
SHA-256: dc9c91884ade7e8a7355b080630ca0c9a607439d56664d764956abe7d6e8961e

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