Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b843d2d4106075…

MALICIOUS

PDF

83.1 KB Created: 2021-03-19 23:30:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 50cf16f75cba35c1720afbb73665915b SHA-1: cddac1cd34ad24cfaaa42b141fd7ca2022861491 SHA-256: e4b843d2d4106075ca84255d62f645182f65a0bc491d29be29cea15ac0a29c89
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The embedded content, though largely unreadable, includes references to 'wkhtmltopdf' and a date, but no direct script execution was observed. The primary attack pattern appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://maypoin.ru/strik?utm_term=brother+p-touch+pt-d210+label+maker+tape PDF link annotation
    • https://cdn.sqhk.co/tedalome/jihihjh/wild_bloodstinger_hunter_deck.pdfIn PDF document text
    • https://cdn.sqhk.co/dixufeja/ugjnhgW/color_roll_3d_levels.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465690/normal_5fe41782b8f19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488103/normal_6011ddc9504e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414173/normal_60304b65b59e0.pdfIn PDF document text
    • https://cdn.sqhk.co/pesamelez/My3fic8/voferobadonurusuxapisu.pdfIn PDF document text
    • https://vawevoza.weebly.com/uploads/1/3/1/4/131482963/jipitunawitipaxotu.pdfIn PDF document text
    • https://cdn.sqhk.co/bimeniwog/W7icicO/maguxalojibuwinuzevuwe.pdfIn PDF document text
    • https://dapalirodo.weebly.com/uploads/1/3/1/4/131483520/tilufobajub-sasalorogexa.pdfIn PDF document text
    • https://kimuremosov.weebly.com/uploads/1/3/4/7/134732255/3788408.pdfIn PDF document text
    • https://cdn.sqhk.co/temokika/gHTjchr/7363160259.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_a5c35482950348bbbb9ca9d1627a08ed.pdf?index=trueIn PDF document text
    • https://42172c5f-463d-425f-bc49-3536d5e9b788.filesusr.com/ugd/3e9aab_235a4d3531e04158af4e453c9d72d437.pdf?index=trueIn PDF document text
    • https://93bb5028-8b17-4c47-8ab9-f46a024b0e86.filesusr.com/ugd/041612_1872a8d102344cc8a5852280e1b73677.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/36297350480.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/pong_atari_2600_rom.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/36557099266.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/zupimonuwefoloxoluj.pdfIn PDF document text
    • https://c7ecfb45-4de9-4174-91ae-4a3416e09b0d.filesusr.com/ugd/fc4f66_4b9f51c5fb4046ec9ac759d4d58c4756.pdf?index=trueIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_b4ba21c17db94a2180bffa0e680ee064.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/winumigutam/how_to_prove_carbon_dioxide_is_needed_for_photosynthesis.pdfIn PDF document text
    • https://bed1e925-73f7-457c-87ff-53f226988024.filesusr.com/ugd/d4a8ce_a2c0c67b9d2040a5a931ef42a8dd671d.pdf?index=trueIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_5910e4138207402bbfdd4e7336ee9c77.pdf?index=trueIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_94eedb7bdb4740ce90846cdf10026c6d.pdf?index=trueIn 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_off0000f67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67A 5748 bytes
SHA-256: 97150bad653148c2f58e3c146de5291b8cedda3d13c0681a902ea95a6d76a184
font_01_sfnt_off000109da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DA 21832 bytes
SHA-256: aa789d7dad5ffb0ec384eae4e0f8ed5d43ffe4c4757d7f8a1653fdc1ffc920ab