Malicious PDF — malware analysis report

Static analysis result for SHA-256 6135771d4887aad7…

MALICIOUS

PDF

68.7 KB Created: 2020-11-26 06:42:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4f0188af49056ab024edd7e6e9779024 SHA-1: 6646587ba0c8df0ab550b0491676f2e0e4a39d34 SHA-256: 6135771d4887aad74bf967e9ba78fe32513c4af9a258c7d48ba5545e49147212
214 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The presence of a large number of external PDF links suggests a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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/strik?utm_term=voices+of+people%2527s+history+howard+zinn+pdf In PDF document text
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/lodisavafoja.pdfIn PDF document text
    • https://luwamagol.weebly.com/uploads/1/3/4/3/134375262/wejil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418575/normal_5f9c8bd5c3db0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366645/normal_5f92061f0be07.pdfIn PDF document text
    • https://sanokigoj.weebly.com/uploads/1/3/4/8/134863934/tefedebobiguvikipute.pdfIn PDF document text
    • https://zebatezovas.weebly.com/uploads/1/3/4/6/134618099/raxinaferupapugi.pdfIn PDF document text
    • https://mixudepira.weebly.com/uploads/1/3/4/3/134379104/2629256.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379968/normal_5f8bc7d8548e6.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/vonuxagupeduze/of_mice_and_men_mood_and_atmosphere.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/statistical_sampling_methods.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/learn_to_fly_2_mills_eagles.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/levowewelusa.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_off0000cff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF7 5484 bytes
SHA-256: 48d12a86c064cd0b1f0e3e88c028b1c6b1bfb53b76b19399992fcacecf7c1ce4
font_01_sfnt_off0000e2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C8 10360 bytes
SHA-256: 7c0679e9c40a0cadf0e3e62e36c7bfd5b7e25bea74e7c02e6d1620bfdd2d2f64

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