Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa7670811507216e…

MALICIOUS

PDF

88.1 KB Created: 2021-03-23 14:32:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: abfbb6eb7addb98cdf5a969848665a30 SHA-1: 2508a94d304d784d24be489c373d53cf46f90426 SHA-256: aa7670811507216e0a973ff9473de986534d85665b955c07ced240e4de9c33f1
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting and utilize UTM parameters, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://bologen.ru/strik?utm_term=garmin+gpsmap+62st+handheld+gps+navigator PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417534/normal_6056527a1b133.pdfIn PDF document text
    • https://radefikifuru.weebly.com/uploads/1/3/4/7/134723330/ruborafer_tasek_mojiwezikalugi_juvani.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471945/normal_5ff50de945ffd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387938/normal_605315838ce89.pdfIn PDF document text
    • http://jesibijifinuz.mywebcommunity.org/66452245451.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447877/normal_5fdc8bdf8adda.pdfIn PDF document text
    • http://navevukosuso.mypressonline.com/the_shining_twins_now_meme.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423728/normal_5ffd7495ed55d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387567/normal_6042089c537d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463264/normal_602c27c71b1ed.pdfIn PDF document text
    • https://ruzamugube.weebly.com/uploads/1/3/4/0/134040566/zijefifugegir-rifavowumele.pdfIn PDF document text
    • http://xozowilozoga.mywebcommunity.org/singer_sewing_machine_model_4562_instruction_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369305/normal_5ff772286331f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486745/normal_601f2a8e38c64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482424/normal_5fd77a56782ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382965/normal_603837f875ce8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411923/normal_6052669232697.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375886/normal_5fdfee9c84656.pdfIn PDF document text
    • https://bufitalusiwe.weebly.com/uploads/1/3/2/6/132682607/7739623.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366385/normal_600deb42a3d73.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
    • http://niwurekatexo.atwebpages.com/omnisphere_2.6_demo.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/how_to_practice_chord_inversions_on_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/31294391381.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A0 5540 bytes
SHA-256: 574ea048f7ff1569b8b433b0e9ea36ebbb983d78edc4905097cbae7f9ca08dfd
font_01_sfnt_off0000fc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4C 2044 bytes
SHA-256: b12f6381bbbad2f1be408ad9b0a29ec83f9dffcbd3244915d8a0269b7c94eb11
font_02_sfnt_off000105da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DA 11552 bytes
SHA-256: ba18219f0a1287fd2e80b1c69b738c890bfd6a77ede55f308c0a0648947e3bad
font_03_sfnt_off00012d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7B 16348 bytes
SHA-256: 53a153fca1e901722de6d91517a353bbb08482a26e9fea8a41629b752af47f25
font_04_sfnt_off00014362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14362 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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