Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa5c9b50bdb0e2cf…

MALICIOUS

PDF

75.8 KB Created: 2021-02-13 11:28:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d1d101900ad7c610042bf8c5e048d797 SHA-1: 8f4619464d1c178afc23aae6bca39782af6f0e52 SHA-256: fa5c9b50bdb0e2cf688a5c34892fe1c5f23eccd912d099a9af21c4146af3d5e9
244 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm designed for SEO manipulation and potentially phishing. It contains a large number of embedded links pointing to external PDF files hosted on various domains, including disposable ones. One critical heuristic indicates a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wix?keyword=a+cut+above+tree+service+reviews In PDF document text
    • https://cdn.sqhk.co/mupijuwo/5jggiid/46981729757.pdfIn PDF document text
    • https://kuxiwidozerapi.weebly.com/uploads/1/3/4/7/134728536/2c0327c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402711/normal_5fc8eae433e02.pdfIn PDF document text
    • https://bemakidej.weebly.com/uploads/1/3/0/7/130739127/nujig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450434/normal_5ffdc69c5604c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411503/normal_5ff29d39b9df9.pdfIn PDF document text
    • https://cdn.sqhk.co/jalafimimodo/yKbuaje/61000408612.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/6gzLthb/bbq_chicken_in_the_oven.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/Pjejc4g/neutron_music_player_eval.pdfIn PDF document text
    • https://xitozenajoxoge.weebly.com/uploads/1/3/2/6/132681812/6409572.pdfIn PDF document text
    • https://nonesuwenuvav.weebly.com/uploads/1/3/4/4/134400251/nenera.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414847/normal_6014530bbbdba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485176/normal_5ffc30712eeec.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/qvhdhca/redevijufofamokalat.pdfIn PDF document text
    • https://buginibonimej.weebly.com/uploads/1/3/2/7/132711973/1881030.pdfIn PDF document text
    • https://cdn.sqhk.co/fejisedetu/1jbjhgf/racing_fever_moto_racing.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ec48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC48 5040 bytes
SHA-256: 59cb4229edac6b34007e83c5246e708daff0dad1744c9cc5f158c79c58c660c8
font_01_sfnt_off0000fd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8E 10752 bytes
SHA-256: 8f5ef4f4169073c167f73c92267474d8c7ee82da6b8db0cba295d1e06114a6f7

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