Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16b81b3a8e33c59…

MALICIOUS

PDF

84.1 KB Created: 2021-03-24 23:10:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: af03f9fa98c95796cb636cfcd444ece6 SHA-1: d1ebf3330e99d88f3314dc50b6a87dd557593308 SHA-256: b16b81b3a8e33c59378f297836a25bd30e1c44aa8797fd312573cc77c4fe35c7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 phishing attempt. The document body, though heavily obfuscated, contains text related to GPS connectivity, likely a lure to disguise the malicious intent. The presence of numerous external URLs, including one pointing to 'bologen.ru', suggests the document is designed to redirect users to malicious sites for further exploitation.

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://bologen.ru/strik?utm_term=why+is+my+versa+not+connecting+to+gps PDF link annotation
    • https://ruzutemeba.weebly.com/uploads/1/3/2/6/132681300/mexen_mapawimala_zewefi_gojesusuwo.pdfIn PDF document text
    • https://cdn.sqhk.co/fisejadiruw/hyqHigj/60228913985.pdfIn PDF document text
    • http://english-10.site/dakajijefesizowetirepurjog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393193/normal_5fdc1497b7ab1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406170/normal_602f6422a5979.pdfIn PDF document text
    • http://freefire-gifts.com/dance_music_freestyle_songs_listjp3eg.pdfIn PDF document text
    • http://redit.fun/retabakilogedemepadbkm01.pdfIn PDF document text
    • https://cdn.sqhk.co/dedesonor/FgfXBBv/wesusexesezunobeja.pdfIn PDF document text
    • https://tegugozitofo.weebly.com/uploads/1/3/0/8/130874592/japeted.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403543/normal_5fe513a2bfd7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425933/normal_601b43398ecef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501975/normal_6044943f82357.pdfIn PDF document text
    • http://55571.ru/coyuchi_organic_sheetsbly2x.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://tekumaworinebu.rf.gd/how_to_know_whether_a_bond_is_polar_or_nonpolar.pdfIn PDF document text
    • http://vazorilumi.epizy.com/suwawedovijuzojito.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_off0000fe0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0F 5280 bytes
SHA-256: 3936670971b8dc60e671d891dd761c891901de0aa6391d6af9214e89d69d48e9
font_01_sfnt_off00010fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE7 10816 bytes
SHA-256: be09e743fc8c672c163670ee6937d9185c85cbbd5d7ed9e7db49fac830c1ee5e
font_02_sfnt_off000134fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FD 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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