Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec5d1100835829a1…

MALICIOUS

PDF

75.4 KB Created: 2021-03-01 00:50:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 655a51816bc6d590f9ee8efacc31ae37 SHA-1: 46834af6d27fb42707bdace9b9ca2ae9bf063080 SHA-256: ec5d1100835829a1f775b700a0a6a445a193025612e082f118b5955f4f79bbe7
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to financial calculations and uses wkhtmltopdf, indicating it's likely a lure to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/123?utm_term=how+to+calculate+3+firm+concentration+ratio PDF link annotation
    • https://safejabev.weebly.com/uploads/1/3/0/7/130739713/3897208.pdfIn PDF document text
    • http://dalkomis.website/the_vertical_diet_meal_plantibsq.pdfIn PDF document text
    • https://lexawuvake.weebly.com/uploads/1/3/4/6/134610488/borigexuden.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381962/normal_5febe97ec3295.pdfIn PDF document text
    • http://milanomodaitaly.site/dyson_v11_motorhead_cordless_vacuum_reviewsnniyt.pdfIn PDF document text
    • http://telemprom.xyz/ratotunupevazijelgdwv.pdfIn PDF document text
    • https://nidabiweni.weebly.com/uploads/1/3/4/8/134865500/sadefuguv-puririziver-vigez.pdfIn PDF document text
    • http://3203epworthcres.com/millers_lab_pricing_guideaxyc7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388274/normal_5fefdc40b3a28.pdfIn PDF document text
    • http://reabook.online/pupagu7fikg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387590/normal_5fc7c6985b800.pdfIn PDF document text
    • http://lassituda.online/625868910673ktct.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/4eiiLhi/38698002699.pdfIn PDF document text
    • https://tovamegudisolos.weebly.com/uploads/1/3/1/4/131411857/1d0cbbfa.pdfIn PDF document text
    • http://tk-time.site/83953397613adqxd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424666/normal_5fc9973c95181.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377109/normal_601fbd4474eb0.pdfIn PDF document text
    • http://lnstagaram-verifiedbadges-from.com/why_wont_security_light_turn_offp1e4l.pdfIn PDF document text
    • http://pomirkapa.site/dewalt_cordless_drill_with_2_batteries_and_chargerqfxc3.pdfIn PDF document text
    • https://nuzunovi.weebly.com/uploads/1/3/5/3/135314570/ddfef99ad14b029.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82E 5068 bytes
SHA-256: ad5bce537aba30fade4a7a744ed14edda9d0ab48e36855fd32e6496cc7ad94f8
font_01_sfnt_off0000f96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96D 11508 bytes
SHA-256: bdc4228104e3fdbaa578a4c23e6fe94e8789227581555fdeeab94e3d098d2256

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