Malicious PDF — malware analysis report

Static analysis result for SHA-256 4608068f34a718d0…

MALICIOUS

PDF

73.3 KB Created: 2021-02-26 14:42:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1329c5340095eddfb3b6bcf5dcefa5b5 SHA-1: 89da9d2de3cab25997be8acae2edc5fb64d74c33 SHA-256: 4608068f34a718d0998f6d7ba5fc3d274b27d4a4e2d167ff6562d40d4031d020
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to 'baarspo.ru' which is flagged as suspicious. Heuristics indicate the PDF is a link farm on disposable hosting, and ClamAV detection confirms it as a phishing trojan. The document body, though heavily obfuscated, suggests a deceptive pretext related to a book review.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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=book+review+all+marketers+are+liars PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375204/normal_5ffa1e54ef2ff.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/blue_jackets_schedule_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367937/normal_5fe06162ec2d8.pdfIn PDF document text
    • https://cdn.sqhk.co/lejukujegomi/SBSqJfm/lewupobevagujebixixudaje.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/20645498037.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369664/normal_600c451a49dd7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450037/normal_5fc572e8d483a.pdfIn PDF document text
    • http://figebofisekozoj.22web.org/huawei_sun2000-_8ktl_data_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/hanlhhr/pocket_racing_yakuza_0.pdfIn PDF document text
    • http://wemuwetafivaxe.sportsontheweb.net/rafadozekijegipur.pdfIn PDF document text
    • https://cdn.sqhk.co/diwiporeb/J7xSdic/ladafopokebujakebagibane.pdfIn PDF document text
    • https://cdn.sqhk.co/loberutebe/9jgC9id/migamoxatex.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/dz96Fih/76168709594.pdfIn PDF document text
    • https://cdn.sqhk.co/zivalutapa/b7ojjcD/colony_bank_douglas_ga_routing_number.pdfIn PDF document text
    • http://optamorem.com/89284138144mvub3.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexofap/Q6jiOhi/nfl_week_12_scores_2018.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bimejevitugera.epizy.com/88001619269.pdfIn PDF document text
    • http://gupizamowakop.myartsonline.com/11560966876.pdfIn PDF document text
    • http://xumixoteralosax.epizy.com/9852554083.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_off0000e3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FB 5096 bytes
SHA-256: f292fda169412b17bbf54adb1bd5368b2e96e9890781a64ec16ed53a04d2f3ff
font_01_sfnt_off0000f552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF552 10184 bytes
SHA-256: 72772daad537f10b818b1a18597a116a846c08c1e5630b78261f4859a469311b

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