Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc989b550920702…

MALICIOUS

PDF

64.6 KB Created: 2020-12-17 22:13:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6fc0f057719582ac28a32bc293594d0e SHA-1: bd87ea34085b95b801e6193ba8c33883de51f959 SHA-256: cfc989b55092070272f9e8160779acf7b9141b51512f66379acf0a5f1e61e9d6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to PDF files hosted on link farms, suggesting a phishing or SEO spam campaign. The document body, though heavily obfuscated, appears to be a lure related to reading improvement, directing users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/123?utm_term=how+to+read+better+and+faster+norman+lewis+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378164/normal_5fad28b027804.pdfIn PDF document text
    • https://gapidekejoz.weebly.com/uploads/1/3/4/8/134876705/1388604.pdfIn PDF document text
    • https://nosozekime.weebly.com/uploads/1/3/4/6/134634018/wetixuwodarim.pdfIn PDF document text
    • https://sutogibigasoju.weebly.com/uploads/1/3/1/0/131070189/fomod-muvogaz-xirar-dixuvebofilane.pdfIn PDF document text
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/c68478389b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476569/normal_5fb7ddefc8dc6.pdfIn PDF document text
    • https://rojusonevupa.weebly.com/uploads/1/3/0/8/130814232/varekubi.pdfIn PDF document text
    • https://zurozudosumo.weebly.com/uploads/1/3/4/7/134719863/9462084.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/xunilukegez/avery_templates_for_word_18160.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58d1f42a-5db7-44da-aea6-6bd8038819a0/5616387604.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/pigoji.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/14881705496.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/disepizigonujolamugufal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0c890f1-54d5-4691-8485-cc41d4452764/xenevebigolerenefulaxomu.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_off0000c11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC11F 5380 bytes
SHA-256: 54d5c7caa82b9e2089a31bad521193fe350b4569a5475518b64931cdd3a10028
font_01_sfnt_off0000d35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35E 10000 bytes
SHA-256: 27e9f0185fe7a7d9c0ca99207225c904f11049ee13c509c1f79195d39acc789d

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