Malicious PDF — malware analysis report

Static analysis result for SHA-256 2638b8083720db8b…

MALICIOUS

PDF

67.3 KB Created: 2020-11-19 03:57:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d8d741eef495e3edd6fb6e4ba3636c2 SHA-1: 15392d7184cb2d4ddbe9d7a468456306f11b81b8 SHA-256: 2638b8083720db8be7298e235cea45452955dc0a197b87c9f6f8395a01e75ad9
214 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a redirector link and part of a link farm. The embedded content, though heavily obfuscated, suggests an attempt to lure users to external malicious sites. The presence of numerous PDF links, including one pointing to known malicious infrastructure, indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=pitbull+dale+lyrics
    • https://kifugezob.weebly.com/uploads/1/3/4/5/134529667/675bc0a9f.pdf
    • https://tunomofezu.weebly.com/uploads/1/3/2/3/132303147/judiruzixav.pdf
    • https://cdn-cms.f-static.net/uploads/4486983/normal_5fb4948ba54f2.pdf
    • https://garijonomiwobe.weebly.com/uploads/1/3/4/7/134711127/lokab_lajovoguxalo_tisesofixet.pdf
    • https://cdn-cms.f-static.net/uploads/4426080/normal_5f9be1184f724.pdf
    • https://cdn-cms.f-static.net/uploads/4422386/normal_5fb02e353cfe0.pdf
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5f87b48a32fcd.pdf
    • https://cdn-cms.f-static.net/uploads/4371508/normal_5f92a92044530.pdf
    • https://cdn-cms.f-static.net/uploads/4416923/normal_5fa4062cdeae2.pdf
    • https://cdn-cms.f-static.net/uploads/4446027/normal_5fa0ed44006ee.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/64a1f57e-6524-4ed0-b466-7e68a81f17f8/66888214622.pdf
    • https://s3.amazonaws.com/norozovijalu/64799973574.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000beb4.bin
1933241e7501d46af345490a87cf1e83040e42b7c09ca7d8353828141ee88d03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB4 4840 bytes
font_01_sfnt_off0000cf33.bin
48cfe272522e39ec43410680bf8388310d87ed206c63c4d848e47cc964401348		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF33 10512 bytes
font_02_sfnt_off0000f277.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF277 4324 bytes

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