Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff494f1aa6e0c20…

MALICIOUS

PDF

76.9 KB Created: 2021-02-07 04:40:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 34afc2c982e66b66eb9c5ab9f9bf1898 SHA-1: 9c5989a6fd34bb62df849f06a23cc6d69b3ed02b SHA-256: 0ff494f1aa6e0c2066415d76141be5ac424d878e84a86aa5f7cd22b0c95a7f2b
214 Risk Score

Malware Insights

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

The PDF contains a significant number of links to external websites, many of which are hosted on link farms or redirector infrastructure, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. The embedded URLs are designed to lure users into clicking them, likely leading to further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/123?utm_term=ids+and+ips+interview+questions In PDF document text
    • https://dagigokes.weebly.com/uploads/1/3/0/7/130739756/0d8c176.pdfIn PDF document text
    • https://solawelosadi.weebly.com/uploads/1/3/1/8/131857655/442bd201cae0.pdfIn PDF document text
    • http://alex-travel.moscow/sumbangan_kerajaan_bani_umayyah_dalam_bidang_politikndep6.pdfIn PDF document text
    • https://gubizelejipeter.weebly.com/uploads/1/3/4/1/134131403/9455333.pdfIn PDF document text
    • https://fakilopatezi.weebly.com/uploads/1/3/1/6/131606638/defitelitela_vefazifuvufotiw_laduporusa.pdfIn PDF document text
    • http://lisolu.org/23531924966ktiiz.pdfIn PDF document text
    • https://mefixakiderix.weebly.com/uploads/1/3/4/3/134319494/9428266.pdfIn PDF document text
    • https://nefupoxuwuridek.weebly.com/uploads/1/3/4/7/134747690/wipunizo-nopixibab-kotuge-pufuwa.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/vovuzize/dituvupizofipapet.pdfIn PDF document text
    • http://wetoxikilosawa.epizy.com/femijogexukagiwosasebagor.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/brave_new_world_revisited.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/factoring_linear_expressions_worksheet_7th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/womenidojipuvazesubid.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_off0000ef89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF89 5136 bytes
SHA-256: 823c775308ab616ecffdf99386fac648dbe991100508a754421607f84b7e5d74
font_01_sfnt_off00010126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10126 11032 bytes
SHA-256: 2168fb61ef0fafac0339cab1a4e5968639f25c3b8724761b49e399e04f266f80

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