Malicious PDF — malware analysis report

Static analysis result for SHA-256 d96043a37c37bcd4…

MALICIOUS

PDF

71.2 KB Created: 2020-11-18 13:44:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1b8c7840d6beadf34cb5947f33e0649b SHA-1: 238f1f7c9beffad33d302c157f1df0e54d73b2e2 SHA-256: d96043a37c37bcd4bc32f9d9a6f9f38af4a5ab60795b64c14ad8516de77f49f1
244 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 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=bunny+black+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413110/normal_5fa19a2c37f80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459322/normal_5fa22c016c36f.pdfIn PDF document text
    • https://bipikive.weebly.com/uploads/1/3/4/3/134342269/ac8887b7.pdfIn PDF document text
    • https://soguleta.weebly.com/uploads/1/3/4/3/134305846/tazosalurufonol_gutit_nigupujakewogo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381738/normal_5f9dc0fd8b205.pdfIn PDF document text
    • https://mawebexakonu.weebly.com/uploads/1/3/4/3/134390129/soturejok.pdfIn PDF document text
    • https://fabobabi.weebly.com/uploads/1/3/4/6/134678451/tevolomuzozevomo.pdfIn PDF document text
    • https://runigofotizete.weebly.com/uploads/1/3/4/4/134433234/riwosarabemo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426262/normal_5fabfb5b6a281.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418381/normal_5fa5a074c3c2a.pdfIn PDF document text
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/7e7a39.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/882d7489-bc57-448f-a550-96b810a7be41/69829839011.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_off0000ccfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFA 4880 bytes
SHA-256: 20dfd57d604dde8a287c294ad16fe80854b5444409cce887513299573c4a4704
font_01_sfnt_off0000dda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA7 10548 bytes
SHA-256: 2695b7aeee0314686c2ed626d73e2fb3a143a5ebecf207537c76eed740120c1f
font_02_sfnt_off000101b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B2 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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