Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e7170905f98807…

MALICIOUS

PDF

81.1 KB Created: 2021-03-17 19:30:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7d3b384f268838e313e959334107c13 SHA-1: 98b9711c9875341d095d6f993b6e1558c12ce61e SHA-256: a1e7170905f98807816b065a0fa756aa3d118b660b91b0fe818a1d1a3f910117
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on low-reputation hosting. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=is+autocad+useful+for+civil+engineers
    • http://summer-italy.fun/2093552659f50ch.pdf
    • http://kleomaften.online/pukanusemusupuxeponijaxlgkrd.pdf
    • https://vinozesuwoda.weebly.com/uploads/1/3/4/6/134685541/jejagezobul.pdf
    • http://trysoda.pro/world_cup_cricket_championship_2pb5we.pdf
    • http://ecoservice-vlad.ru/kannada_devotional_album_songs_free9xj6n.pdf
    • http://magic-world.site/adverbs_of_manner_worksheets_grade_4h11h6.pdf
    • http://gejesixave.scienceontheweb.net/map_reading_skills.pdf
    • https://jitedamanun.weebly.com/uploads/1/3/4/6/134627504/vabadiwixoxejov_wovuvobatima.pdf
    • https://motadonikedubi.weebly.com/uploads/1/3/1/8/131856170/dffba0309.pdf
    • https://kovelikazaw.weebly.com/uploads/1/3/4/7/134705675/c00e2.pdf
    • http://cleanup-sale.site/rheem_22v40f1_pilot_assemblyacf33.pdf
    • http://maska-respirator.com/national_geographic_usa_july_2019b6pav.pdf
    • http://kowesawu.iblogger.org/5979487026.pdf
    • http://austritkfa.com/esv_bible_scripturesnxr8i.pdf
    • http://dutalamujuso.66ghz.com/88788465429.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_49596b05a51e47c89b9fe84cc5b18e64.pdf?index=true
    • http://lujovaku.epizy.com/diseases_of_female_reproductive_system.pdf
    • https://933afb0c-60ca-4ff4-ba38-e7c804ca925d.filesusr.com/ugd/941881_31571b6d5134425cac4e03752f940dff.pdf?index=true
    • http://vexabimumemig.atwebpages.com/how_much_do_pennsylvania_educators_get_paid.pdf
    • http://kivarutumo.myartsonline.com/barigitelevajavalimeligel.pdf
    • https://9b321a86-0615-40a7-b684-6dced782f4cc.filesusr.com/ugd/e3cae3_423a0f7d58904bf493aa17396648a81a.pdf?index=true
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_60c5ee9d393c43d8a5ab6494464c9351.pdf?index=true
    • 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_off0000f0c3.bin
66e1621ae7dab1de5d467d368f67f6b86aad70decf2f8fa8d1d33c3d27425c7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C3 5068 bytes
font_01_sfnt_off0001020a.bin
2e273e79f31d83759480e231f9a0cf22724545d3a74444ece74cf0f7564bade0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1020A 11796 bytes
font_02_sfnt_off000128ca.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128CA 4324 bytes

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