Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca7ef970f94cfd3…

MALICIOUS

PDF

69.3 KB Created: 2020-11-18 22:27:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ca2c2a7c32046a2fcf5f2cf72a0f9f0 SHA-1: 9975e215954fd61fd193c5d20e3f6b7872376dd7 SHA-256: aca7ef970f94cfd37650c0fbfaa5a6cd23ae36ff8809923ee34b90e543f388d0
244 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, with a significant portion pointing to disposable hosting and redirector infrastructure, indicating a malicious intent to direct users to potentially harmful sites. The ClamAV detection and ML classifier strongly suggest this is a phishing or malicious content delivery mechanism. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://cctraff.ru/123?utm_term=renacimiento+pdf+literatura
    • https://jazezuko.weebly.com/uploads/1/3/4/3/134389352/rijamufe.pdf
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/rebodi.pdf
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/3808383.pdf
    • https://zupawifotifawe.weebly.com/uploads/1/3/4/4/134480263/9077162.pdf
    • https://cdn-cms.f-static.net/uploads/4365598/normal_5f986fd32a44b.pdf
    • https://dotitikedobe.weebly.com/uploads/1/3/4/4/134493035/59e588.pdf
    • https://kitarenabokuvum.weebly.com/uploads/1/3/4/4/134479912/1588933.pdf
    • https://zexirajeroluwub.weebly.com/uploads/1/3/4/8/134848753/2167227.pdf
    • https://niresofet.weebly.com/uploads/1/3/2/6/132682193/5f6f336dc68.pdf
    • https://lozugukavokukes.weebly.com/uploads/1/3/4/3/134357100/luxuzukuboko_sujotaxaxifugel_liruso_lobizarawuritag.pdf
    • https://mobuzuwatajol.weebly.com/uploads/1/3/4/3/134310732/68564b1d9a98d82.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fotojipifuzitul/pokosiwog.pdf
    • https://uploads.strikinglycdn.com/files/2b32f847-f7a1-435d-a958-ba24df1606a9/05_mustang_gt_engine.pdf
    • https://s3.amazonaws.com/fasanag/health_psychology_test_bank.pdf
    • https://uploads.strikinglycdn.com/files/c06395ee-1b66-4942-8779-7b46644aff11/lafosazu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3bc.bin
eaa9a00e595790197b00d3175ab439f386ac14d67b2c1e9271b221bfb97701a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BC 5132 bytes
font_01_sfnt_off0000e524.bin
42f5ac5f8b8677ed4574ad9419fa4a34863486ef00b2687b2471c7265e977f47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE524 10676 bytes

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