Malicious PDF — malware analysis report

Static analysis result for SHA-256 64ffb7d356dc66d9…

MALICIOUS

PDF

89.3 KB Created: 2021-03-28 22:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9694e0d80edcc28180b13d98a4f1e45 SHA-1: 7ff9e7dcd0781a1c8efc755020a8fcaa3fff5700 SHA-256: 64ffb7d356dc66d932035dffc93f8c00f0cf17655e8c47ae97ff90eac21f7443
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical detection for a link farm and a high ML score. The document contains numerous embedded URLs, many of which point to PDF files hosted on suspicious domains, suggesting a phishing or malware distribution campaign. The presence of external URIs and the overall structure indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://jacksth.ru/strik?utm_term=bntx+stock+prediction+2021
    • http://xunarepozufuz.mygamesonline.org/54783207086.pdf
    • http://kijofizovurisos.medianewsonline.com/23729048287.pdf
    • https://cdn-cms.f-static.net/uploads/4386606/normal_600f249e48e7c.pdf
    • https://static.s123-cdn-static.com/uploads/4473637/normal_5fcd535028fc0.pdf
    • https://cdn-cms.f-static.net/uploads/4464521/normal_5fe635dab39df.pdf
    • http://about-central.com/75313527200lulb7.pdf
    • https://cdn-cms.f-static.net/uploads/4477630/normal_605b6fe51660d.pdf
    • https://dibovasejul.weebly.com/uploads/1/3/1/0/131070518/6764995.pdf
    • https://wivutabunoku.weebly.com/uploads/1/3/6/0/136020101/8746289.pdf
    • https://ninijaliwejito.weebly.com/uploads/1/3/4/3/134350726/dabutaguwe_lototega_tubeli_zukofupisedume.pdf
    • https://cdn-cms.f-static.net/uploads/4491173/normal_6040dde10da13.pdf
    • http://majejuf.22web.org/ibm_i_holocaust_chomikuj.pdf
    • https://cdn-cms.f-static.net/uploads/4485809/normal_5fd7defc00d33.pdf
    • https://memetunariva.weebly.com/uploads/1/3/1/4/131454345/situgutu.pdf
    • http://lozhobelir.space/echo_leaf_blower_will_not_run_full_throttlejiivw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://gulavutimomoxu.rf.gd/25075708831.pdf
    • http://jowatazurusu.epizy.com/gonasavoxir.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_off0001104e.bin
f781e84461b921391b14e35ada498557fe12fc5e7ed5c282b3bf631492e5e722		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1104E 5120 bytes
font_01_sfnt_off000121d7.bin
7d6626fbc91f8448ef435b5a9f2cc9dc7ec275aecd03a84dee03a9a690e7444c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121D7 11844 bytes
font_02_sfnt_off00014a32.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A32 4324 bytes

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