Malicious PDF — malware analysis report

Static analysis result for SHA-256 261eac6b832ef51e…

MALICIOUS

PDF

75.7 KB Created: 2021-01-16 06:43:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5521366c561d44b5021b041370308874 SHA-1: df91b8a538e9dc2fdb892c64165bf6d70d60eb32 SHA-256: 261eac6b832ef51e3edfae390ef6555e009326bb5cdb375131c7f3da4140f4d6
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and redirect to other locations. One prominent URL, 'https://traffine.ru/123?utm_term=minecraft+pe+latest+version+apk+free+download', suggests a lure related to downloading Minecraft. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/123?utm_term=minecraft+pe+latest+version+apk+free+download In PDF document text
    • https://site-1178164.mozfiles.com/files/1178164/13895197433.pdfIn PDF document text
    • https://cdn.sqhk.co/fefuxumito/hEjdrja/91504988138.pdfIn PDF document text
    • https://site-1177693.mozfiles.com/files/1177693/77572298610.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422136/normal_5ff1f4ff52e6f.pdfIn PDF document text
    • https://lopiranurepo.weebly.com/uploads/1/3/4/7/134735856/582bc5.pdfIn PDF document text
    • https://site-1168130.mozfiles.com/files/1168130/sigetixoxexowalinorezeji.pdfIn PDF document text
    • https://cdn.sqhk.co/nivunufozub/ciiggaU/63992183194.pdfIn PDF document text
    • https://site-1178570.mozfiles.com/files/1178570/skin_colored_mole_on_my_dog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388598/normal_5f995d26acaea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482020/normal_5fa9e3ae2ae08.pdfIn PDF document text
    • https://cdn.sqhk.co/lidupusumoj/l8ie8gd/vikewizakopuzabove.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/1867598.pdfIn PDF document text
    • https://cdn.sqhk.co/vadetegubufo/8BQbu8F/kung_fu_action_movies_2020.pdfIn PDF document text
    • https://site-1176413.mozfiles.com/files/1176413/mosuxoropovijixageweva.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1C 5156 bytes
SHA-256: e92d5de9a5ec92cce8ab2ad30cc20d4cf4914957b444106abaa369c44db128ec
font_01_sfnt_off0000efbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBF 10472 bytes
SHA-256: 0dc06e0d03f21bca0614dce6d5ec498b0c71b1a12bda29afb799d3741f8c2fcd
font_02_sfnt_off0001136f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136F 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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