Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f6b74ac4a830be…

MALICIOUS

PDF

75.2 KB Created: 2021-02-18 10:36:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 95a56d157e1c259fbebc685d2db0fec2 SHA-1: 0f6e3f4d33009404dae2b3fec3b8b4d6cc8b1f4b SHA-256: a4f6b74ac4a830be2cec28dad92d904147b6f7357fbf9208f58b3410cfc82895
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, indicating it functions as a link farm. Heuristics like PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM strongly suggest this behavior, with URLs pointing to various domains. The ML classifier and ClamAV detection further support its malicious nature, likely for SEO manipulation or to distribute malware. No scripts were extracted, but the primary attack pattern involves directing users to external, potentially malicious, websites.

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
  • 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.
  • 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://bologen.ru/wix?keyword=ucweb+apk+pc PDF link annotation
    • http://choosenews.space/vegetarian_keto_diet_meal_planqjukr.pdfIn PDF document text
    • https://cdn.sqhk.co/womibakok/2MYjjgi/47442785422.pdfIn PDF document text
    • http://niscourse.com/8935641831nr1st.pdfIn PDF document text
    • https://nusevusigafub.weebly.com/uploads/1/3/1/3/131398220/raladexupuxozi.pdfIn PDF document text
    • https://cdn.sqhk.co/xamubana/xjfiejh/16763884135.pdfIn PDF document text
    • https://sotugipuzelaj.weebly.com/uploads/1/3/0/7/130738723/dawitavuk.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/cNjeHih/18135899772.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/id3jggi/gacha_life_videos_funny.pdfIn PDF document text
    • http://runivofo.iblogger.org/tremble_chords_key_of_g.pdfIn PDF document text
    • http://mojuluxemo.22web.org/76480721567.pdfIn PDF document text
    • http://stingeksoj.online/tobujegikowijemer9b0f1.pdfIn PDF document text
    • https://cdn.sqhk.co/pekotegafod/piaFm9J/my_cloud_home_apple_tv.pdfIn PDF document text
    • http://lnstagramcopyrigtservice.com/is_acres_of_diamonds_a_true_storyt1q59.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://lununobasafino.rf.gd/calendar_invite_meeting_template.pdfIn PDF document text
    • http://jukikusikodopom.epizy.com/persuasive_essay_against_school_uniforms_introduction.pdfIn PDF document text
    • http://redebalumu.rf.gd/29751907412.pdfIn PDF document text
    • http://kugesiv.epizy.com/dishonored_2_ghost_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FB 4352 bytes
SHA-256: 07a76119cd89ec111a94a89e25a30a63191cbf76f1e6b6cd9313f764b1ea25bd
font_01_sfnt_off0000efcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCF 9944 bytes
SHA-256: 75647cb2ac829e38d1fc0419611f903a03ee3d345cd9f70a73520cbddea58b83
font_02_sfnt_off000111da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DA 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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