Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe84edd1159584f…

MALICIOUS

PDF

113.4 KB Created: 2021-04-25 18:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 396cde7d3e986c450d552a96e976b572 SHA-1: 21f5c1a9446369847abb8ff99364f921ef6d3f4c SHA-256: dfe84edd1159584f60818312f13c525a81493bb0eb98b6dc59c3177893355684
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or spam campaign. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though partially corrupted, contains a title related to 'prayer beads' and metadata indicating it was generated by wkhtmltopdf, often used for SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jottigo.ru/strik?utm_term=how+to+get+prayer+beads PDF link annotation
    • http://xipelosowux.22web.org/81741179701.pdfIn PDF document text
    • https://cdn.sqhk.co/nawamuzimosu/iaHFkMj/plate_bending_machine_design.pdfIn PDF document text
    • https://lubozukutiximik.weebly.com/uploads/1/3/4/4/134472848/taxumuwew.pdfIn PDF document text
    • https://kukibujez.weebly.com/uploads/1/3/1/6/131637652/7204093.pdfIn PDF document text
    • https://jedijevabepepox.weebly.com/uploads/1/3/0/7/130739982/7798444.pdfIn PDF document text
    • https://nipotowolexitav.weebly.com/uploads/1/3/4/6/134639117/lemowalalenibupesupi.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzekofuwe/1liiKrj/appeals_to_ethos_pathos_and_logos_worksheet.pdfIn PDF document text
    • https://vemugalibi.weebly.com/uploads/1/3/4/4/134484787/7db3b069.pdfIn PDF document text
    • http://tapikival.22web.org/pdf_watermark_remover_portable.pdfIn PDF document text
    • https://tepewumulu.weebly.com/uploads/1/3/1/3/131384412/999855.pdfIn PDF document text
    • https://sokevabo.weebly.com/uploads/1/3/4/6/134665749/4900633.pdfIn PDF document text
    • https://cdn.sqhk.co/susiwozobo/Pf4haja/48399959353.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414867/normal_600a9206aa58f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410204/normal_6006616dd5dc6.pdfIn PDF document text
    • http://femovanisom.iblogger.org/deziwoj.pdfIn PDF document text
    • https://didunomupipopad.weebly.com/uploads/1/3/1/4/131438203/2195242.pdfIn PDF document text
    • https://wufopuse.weebly.com/uploads/1/3/5/3/135300065/wapogowewipu.pdfIn PDF document text
    • https://cdn.sqhk.co/tedubifo/cYWnsgi/fallout_shelter_pregnant_dwellers_not_giving_birth.pdfIn PDF document text
    • https://nedotumawu.weebly.com/uploads/1/3/4/6/134626041/norajifu.pdfIn PDF document text
    • https://cdn.sqhk.co/rozesivotix/Mshdqhg/milkshake_recipes_easy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/7da8ca79-fe93-4ada-9400-80a292574467/sat_test_score_1190.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14d6bcf0-6d16-46ca-aefa-fd3bc84f3f2a/winik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f664ba35-a93e-49d0-8ff6-5b2aedef2901/jack_and_the_beanstalk_characters_sparklebox.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17313 5024 bytes
SHA-256: 3ac0cb0f136a18e872fdc7bc0e58c56805145c5068cb66c677f536dec34e667c
font_01_sfnt_off00018445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18445 11280 bytes
SHA-256: eddf7eb209fac88222806c568b9796109adad9c8b4e459c8f851bce7824bc281
font_02_sfnt_off0001aa01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA01 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378