Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b24df3a8327a269…

MALICIOUS

PDF

105.3 KB Created: 2021-03-14 23:46:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 736937d0da8a58065a50257f86dc71a8 SHA-1: 22b1f29bf034b5f3f5e82f60a93d2da8d6a07697 SHA-256: 5b24df3a8327a269877beb1d3cd4b788e43aa1d17f7702a04412d61123c37ed1
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, including one to `https://baarspo.ru/award?keyword=lysogenic+cycle+of+lambda+phage+pdf`, suggesting an attempt to drive traffic to potentially malicious or spam-related websites. The document body is heavily obfuscated and appears to be generated content, further supporting the link farm and SEO spam hypothesis.

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://baarspo.ru/award?keyword=lysogenic+cycle+of+lambda+phage+pdf PDF link annotation
    • https://cdn.sqhk.co/noxisoture/Hicvji6/54962923039.pdfIn PDF document text
    • https://nofizosol.weebly.com/uploads/1/3/4/5/134500220/1996393.pdfIn PDF document text
    • https://cdn.sqhk.co/purovufizu/7G0jjij/fox_cineplex_banning_ca_showtimes.pdfIn PDF document text
    • https://boxusuvibirux.weebly.com/uploads/1/3/5/3/135308560/e3ffa7aa9639.pdfIn PDF document text
    • https://nabaladeso.weebly.com/uploads/1/3/1/4/131438379/sujolisaje.pdfIn PDF document text
    • https://cdn.sqhk.co/sekigizakeku/hdN2hjh/i_ve_been_cooped_up_in_the_house.pdfIn PDF document text
    • https://nipituwosaxow.weebly.com/uploads/1/3/5/3/135312928/9424838.pdfIn PDF document text
    • https://jajesawi.weebly.com/uploads/1/3/0/8/130813829/71f58e82a.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/doRjhaB/sarubujasozezamujik.pdfIn PDF document text
    • https://cdn.sqhk.co/dediwifime/aigIklK/gosevu.pdfIn PDF document text
    • https://cdn.sqhk.co/tukawezezo/jZigAH0/divusumofenafug.pdfIn PDF document text
    • https://cdn.sqhk.co/virapazetif/jdPFjcB/game_of_thrones_guitar_ringtone_free_download.pdfIn PDF document text
    • https://ruwitopiramowu.weebly.com/uploads/1/3/4/3/134364975/felir.pdfIn PDF document text
    • https://cdn.sqhk.co/tegiriwepaj/Qkhdjb2/nasa_mars_rover_perseverance_names.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/voropa/23289526651.pdfIn PDF document text
    • http://nowuzapifara.rf.gd/83101108441.pdfIn PDF document text
    • https://s3.amazonaws.com/ponivotigegepub/47987279407.pdfIn PDF document text
    • http://runopokasuvi.epizy.com/gejulumififutesakese.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_off00015b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B45 5656 bytes
SHA-256: d7bbc53237e05f5fe20e9f86b79d4e890b7910648b5a51048f135fc1c82465e5
font_01_sfnt_off00016e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E6A 12376 bytes
SHA-256: ddbb5a641f8a4793adb77f37f9b7c12f9feb74851114765d791e4d4d8bdd5c14

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