Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc16ad1f1408862c…

MALICIOUS

PDF

72.8 KB Created: 2021-02-27 21:40:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e744980da60a2466128c310cf50e5623 SHA-1: 9328586cfbc423cebb21ed8d8876f18183114b14 SHA-256: fc16ad1f1408862cd17d9a5e269d117620b40878b228b71a5d370c38308034a2
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 hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on potentially untrusted domains. The presence of external URIs suggests the document is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://midufefew.ru/aws?utm_term=how+to+update+sims+4+patch+without+origin
    • http://xasunibi.iblogger.org/coliform_and_e_coli.pdf
    • https://redodire.weebly.com/uploads/1/3/1/4/131408340/sudeterob-ziwuwa-kukivo.pdf
    • http://jesiwufap.iblogger.org/inglesina_fast_table_chair_manual.pdf
    • https://cdn.sqhk.co/laxegipo/ijbhbAT/40120049380.pdf
    • https://cdn.sqhk.co/navuwamas/oHVjgWx/susuxenufaze.pdf
    • https://cdn.sqhk.co/pivokazi/nidCEjg/stackers_jewelry_box_us.pdf
    • https://sibotapitagota.weebly.com/uploads/1/3/4/3/134378411/timoligajak.pdf
    • https://kuvomudoriri.weebly.com/uploads/1/3/1/4/131406544/a80790d.pdf
    • https://static.s123-cdn-static.com/uploads/4421208/normal_5ff1e35a07777.pdf
    • https://static.s123-cdn-static.com/uploads/4465025/normal_5ff28569bf2cf.pdf
    • https://selilanabos.weebly.com/uploads/1/3/4/8/134875664/nozamujob.pdf
    • https://static.s123-cdn-static.com/uploads/4426541/normal_5fff7c65ea41c.pdf
    • https://binezorimitujux.weebly.com/uploads/1/3/4/3/134337637/2713176.pdf
    • https://pudijeda.weebly.com/uploads/1/3/4/5/134586696/5830246.pdf
    • https://static.s123-cdn-static.com/uploads/4486523/normal_5fde4db07ed3e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://godutiliwaganos.rf.gd/cips_ethics_exam_questions_and_answers.pdf
    • http://bidasumibave.epizy.com/ruririkefibowuwakele.pdf
    • https://s3.amazonaws.com/jamuluvuvava/waxila.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df44.bin
a5ff2c451ede33703d4d164c874e0e1433b3d6d9a4d5dffe399e2e3654aec9c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF44 5596 bytes
font_01_sfnt_off0000f23c.bin
49443dc0ef12f2953462b4625d6933221cdb2d98125093db89e9a7a03b513d99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF23C 10500 bytes

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