Malicious PDF — malware analysis report

Static analysis result for SHA-256 f191af2a114c0914…

MALICIOUS

PDF

92.9 KB Created: 2021-03-08 09:30:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 34fa23ce28c0fa184efbee64c81deac9 SHA-1: 21d876ca3ee45a3c43b7d354fe51a30f0840fa43 SHA-256: f191af2a114c09147ee4ea71fbd5e6eb57e9cd66859a655e869b35d224fe7c54
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with several pointing to known malicious redirector infrastructure and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically to appear as a document, likely to lure users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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 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://dafemum.ru/wix?keyword=ef+schumacher+a+guide+for+the+perplexed+pdf In PDF document text
    • http://vclean-sale.shop/500840395287o7hd.pdfIn PDF document text
    • https://cdn.sqhk.co/lukulobu/djchbji/rizoja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367925/normal_6020c0b2a9b68.pdfIn PDF document text
    • http://siondez.ru/7_principles_of_communication_pptq46p6.pdfIn PDF document text
    • https://cdn.sqhk.co/jipogidara/jhlIghb/memoratasitoletibida.pdfIn PDF document text
    • https://fekolulowezomo.weebly.com/uploads/1/3/4/5/134593542/fuwimoza-guvovijivupepat.pdfIn PDF document text
    • http://yogait.space/41596254493h6du8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455207/normal_5ffc229730f3c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370077/normal_5fe0573beb424.pdfIn PDF document text
    • https://dajilifu.weebly.com/uploads/1/3/4/8/134891154/6266154.pdfIn PDF document text
    • https://besekexedonake.weebly.com/uploads/1/3/2/7/132741764/1815420.pdfIn PDF document text
    • http://reflectionss.space/grupos_whatsapp_gay_de_enlacewc4hg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486997/normal_60109aef30c3f.pdfIn PDF document text
    • https://siwusoxol.weebly.com/uploads/1/3/4/5/134584737/xowude_tuxeboli_jinim.pdfIn PDF document text
    • https://cdn.sqhk.co/bupusudiva/b0gcjhy/leap_netflix_removed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369797/normal_6006c5eb4dd9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401505/normal_5fd8b7f0b1630.pdfIn PDF document text
    • https://cdn.sqhk.co/gutinisiv/exFhiib/fejil.pdfIn PDF document text
    • https://cdn.sqhk.co/duvapegoleva/hZgGjaS/18753798107.pdfIn PDF document text
    • http://trackcreditscore.info/dbt_training_2020_near_meoaoxs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463808/normal_60224df80b2dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445880/normal_6033d736a2481.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/gajakelegeza/namaz_dualar_trke_okunuu.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/how_to_treat_cystic_acne_while_pregnant.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_off00012f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F25 5596 bytes
SHA-256: d401f519c8f515d321a27a2ce63c0e144ef1a7d4b797e2000fb558740ad8027c
font_01_sfnt_off0001420d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1420D 10816 bytes
SHA-256: 2a6e2f87b27771a8d964235c01944116e2740a93e39023fcb2a5dc30b1ceddd6