Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1af065bdf6870bb…

MALICIOUS

PDF

91.0 KB Created: 2021-04-03 01:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 41119c2ae5dce09ba331b61ff3e0c344 SHA-1: 94a87726c6c9f25fe753eb9c09657b70590f70d6 SHA-256: a1af065bdf6870bb0e96e48d1f0a9a6e74c41ffaa20c2809adf7b9e76dbafb53
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains and link farms, indicating a phishing or SEO manipulation attempt. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the overall structure strongly suggest the document's purpose is to redirect users to malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://golowaki.ru/123?utm_term=acetic+anhydride+and+formic+acid+reaction PDF link annotation
    • https://cdn.sqhk.co/rufadexu/ha5QHhj/xaneluzubuwaxiwik.pdfIn PDF document text
    • https://wamibujobaju.weebly.com/uploads/1/3/4/7/134716207/lakawevenov_wuzezofujivegav.pdfIn PDF document text
    • https://cdn.sqhk.co/gesafafo/eriigcg/2177536955.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450260/normal_60507d883d65f.pdfIn PDF document text
    • http://profer-opt.ru/shimano_ultegra_di2_groupset_price_philippinest8o64.pdfIn PDF document text
    • https://romenazojojeles.weebly.com/uploads/1/3/0/7/130775884/be7ffbd545e9.pdfIn PDF document text
    • https://netokuwusava.weebly.com/uploads/1/3/4/3/134384506/9953702.pdfIn PDF document text
    • https://cdn.sqhk.co/sewujuzanas/j3ajbI1/azara_healthcare_careers.pdfIn PDF document text
    • https://cdn.sqhk.co/pabefidinaz/ihjafjb/mars_terraforming_elon_musk.pdfIn PDF document text
    • https://cdn.sqhk.co/terasovo/exfjcIQ/bimatoprost_ophthalmic_solution_0._03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387219/normal_603a0f0cbc22d.pdfIn PDF document text
    • https://cdn.sqhk.co/raguwubives/dMjjoie/live_video_wallpaper_iphone_x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408482/normal_60069b3181ba8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386347/normal_604105c9e19fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420589/normal_5fdb25740e12c.pdfIn PDF document text
    • http://arfesopt.com/menaveliwalala9mup9.pdfIn PDF document text
    • https://cdn.sqhk.co/zezetemirag/eLjjha7/84757489892.pdfIn PDF document text
    • https://cdn.sqhk.co/fexiseme/jb4Adhe/candy_bomb_strain.pdfIn PDF document text
    • http://uber-global.com/rikiwesizamigafowuper8evs8.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://wosakev.epizy.com/how_to_put_ubee_in_bridge_mode.pdfIn PDF document text
    • http://jidoxib.rf.gd/kuvesupekaxameza.pdfIn PDF document text
    • http://limufewugewo.rf.gd/kexujipaxikitofajolafit.pdfIn PDF document text
    • http://sasomibaben.rf.gd/verbal_analysis_test.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10158 4932 bytes
SHA-256: 3bd5695a6082d6378fe51cfab70733ea5e2c0881f2c680ee2491b3cc305ce23b
font_01_sfnt_off000111e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E8 11728 bytes
SHA-256: e792c2b6e648fe0ba7b9de2d96573706c3947a3fffa93485c2f8b9f92319b096
font_02_sfnt_off00013917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13917 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7
font_03_sfnt_off00014daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DAF 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361