Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7733d11ca2de101…

MALICIOUS

PDF

67.8 KB Created: 2021-01-19 16:20:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 34c8e877e857b1ebb7d058997cdd6774 SHA-1: 46d9d5fd4dd7e4b8c57068649a1ea522f05bacbe SHA-256: a7733d11ca2de10128c0693a032ff85a44299d547761a7f074a76f013bb88b4d
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting, and at least one link to known malicious redirector infrastructure. This suggests the document is designed to direct users to potentially harmful websites, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://ggtraff.ru/123?utm_term=mosquito+netting+fabric+by+the+yard In PDF document text
    • https://cdn-cms.f-static.net/uploads/4448137/normal_5fb3449db1d2b.pdfIn PDF document text
    • https://vebajixumese.weebly.com/uploads/1/3/4/4/134483039/xokofaselekib.pdfIn PDF document text
    • https://site-1198856.mozfiles.com/files/1198856/fill_3d_print_gaps.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426279/normal_5f9a121c21087.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367622/normal_5fc732bb9063d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450504/normal_5fe95c8102651.pdfIn PDF document text
    • https://site-1227540.mozfiles.com/files/1227540/photo_editor_android_app_source_code.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372376/normal_5f8b6e5198428.pdfIn PDF document text
    • https://mabamigetope.weebly.com/uploads/1/3/4/4/134493328/beloturem.pdfIn PDF document text
    • https://cdn.sqhk.co/satidaruxami/0b39qjj/kohls_cash_days_2020.pdfIn PDF document text
    • https://site-1178025.mozfiles.com/files/1178025/tape_it_up.pdfIn PDF document text
    • https://site-1167961.mozfiles.com/files/1167961/aatish_movie_full.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/VpjhkUh/joxabosogonu.pdfIn PDF document text
    • https://tazidafojunuxu.weebly.com/uploads/1/3/3/9/133997245/latidonamujazujejuke.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/iT5ghhP/59253594623.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417648/normal_5fc1a64fbc520.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/66716957816.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/72402052301.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/lafogusizizebixurunewata.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC1 5624 bytes
SHA-256: 06d35fd4597fb5c6c7dc76403e523414d4c588c28d48ea95af1301e974fba48a
font_01_sfnt_off0000dde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE6 10296 bytes
SHA-256: dc0b6d9fdb521160aa6aedbf8d07c10bc449733a297a7697978ad6127fdd0858

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