Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb31bac565a1fc42…

MALICIOUS

PDF

132.2 KB Created: 2020-12-20 11:12:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6adfd1b23f83ce8de3bd90add81479f3 SHA-1: c49f144424ed8d3336c909924ba35a60d9e6ac84 SHA-256: bb31bac565a1fc42eaf31cce6377f6462c278cbfc3e6156fa6482a2548ca5311
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/strik?utm_term=a+challenge+to+the+dark In PDF document text
    • https://wukelefitifaka.weebly.com/uploads/1/3/4/8/134882985/3321938.pdfIn PDF document text
    • https://rexekimat.weebly.com/uploads/1/3/4/0/134017736/nulufivovejuwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419629/normal_5fbd547f1fa2d.pdfIn PDF document text
    • https://nibafowezibinax.weebly.com/uploads/1/3/4/3/134319588/4299133.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403414/normal_5f9a6ad6322fb.pdfIn PDF document text
    • https://milevewon.weebly.com/uploads/1/3/4/0/134041257/8f7ef04083c5c.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://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd42f12de71506718cdedd/1606238961619/crock_pot_little_dipper_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/glassworks_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/38207788908.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdc9bbe50f46d6500014148/t/5fdd0ceb3754d1036a1cf849/1608322284346/frog_hair_fluorocarbon_tippet_100m_guide_spool.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce83f5e062a60368bcad7e/t/5fd6d1fe0f11661d4c3cea9b/1607913982374/nipufenezamipuku.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/arctic_king_window_ac_unit.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdcbb9339856919c2930471/t/5fdd05f41f72e97a2b44cff1/1608320501581/nuwijudi.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/firefox_esr_older_versions.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_off0001bc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC49 4816 bytes
SHA-256: c14aeebb14c57fccd68ef217308ecf104d5b49290f0b59ad971052e40566531f
font_01_sfnt_off0001cc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC92 12132 bytes
SHA-256: 81e9745caf09baef01ed5c1c059d5231d4d1ef0b673d606750f5e7072c4545cd
font_02_sfnt_off0001f583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F583 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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