Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d8062afb8f6223…

MALICIOUS

PDF

85.0 KB Created: 2021-01-06 13:36:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2cf2fefad6a8ea4f2f91211bd15498b3 SHA-1: e7cfca517d6d060f103844f8257f87fb45733aca SHA-256: 88d8062afb8f62233ce55fab25a97a70708aec8750acc60d222290c0709cdbcd
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on disposable or potentially compromised domains. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one URL leads to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing malware via a link farm.

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://traffmen.ru/aws?utm_term=reading+comprehension+multiple+choice+worksheets+grade+4 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4488555/normal_5feb9ba7821db.pdfIn PDF document text
    • https://terarawuterojuz.weebly.com/uploads/1/3/0/7/130739827/f3c273a24b4e6.pdfIn PDF document text
    • https://jufavufopu.weebly.com/uploads/1/3/4/3/134340263/840151.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/iihhCid/35699256183.pdfIn PDF document text
    • https://cdn.sqhk.co/vimanagadu/iighIXQ/best_snes_games_ranked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456128/normal_5fb6c15b4163c.pdfIn PDF document text
    • https://nelizebowi.weebly.com/uploads/1/3/4/7/134734992/868777.pdfIn PDF document text
    • https://sajixigepanosu.weebly.com/uploads/1/3/1/0/131070231/f71ef8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366302/normal_5f87ea8cb42e9.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/404f8d6a972a0b1.pdfIn PDF document text
    • https://tozarezev.weebly.com/uploads/1/3/4/3/134374844/622230.pdfIn PDF document text
    • https://cdn.sqhk.co/bekegeraw/ijojcyM/candy_corn_fabric_hobby_lobby.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/800b0ae8-e3a7-4a57-aa1e-520073475de5/44825963578.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_off0000ff90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF90 5620 bytes
SHA-256: 6913a3f42b33a743b1898a098549bf5f063c5a7538a77eccaa75f9b3d8dd6ff4
font_01_sfnt_off00011294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11294 11100 bytes
SHA-256: e3a9312b1e565618769a367dd84d50e1c65d91aec350546e88d9cd3ad841e619
font_02_sfnt_off00013836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13836 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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