Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37dc4c51c479dc5…

MALICIOUS

PDF

66.4 KB Created: 2021-02-23 15:55:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a75607d94de87c4f84ffbd4d2dfa1f18 SHA-1: 59e6af86b8a9b899686208541ea7d1a42237b22c SHA-256: f37dc4c51c479dc536bc64ea24da15941aaf4c5550bccbfd398433dd3400a386
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are disguised as PDF documents, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The embedded URLs are likely used to redirect users to malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wix?keyword=ver+pelicula+1917+online+espa%25C3%25B1ol+latino
    • http://boevoenlp.com/androidx_recyclerview_dependencyijm7b.pdf
    • http://waystep.site/quote_red_queen_alice_wonderlandduz2u.pdf
    • https://cdn.sqhk.co/ruxesotovo/iajahf3/tozikud.pdf
    • https://sipesavuw.weebly.com/uploads/1/3/4/6/134697333/c6d76e8180022e.pdf
    • https://cdn.sqhk.co/baresupujar/7hiijpa/bixizukaseno.pdf
    • https://povizizumor.weebly.com/uploads/1/3/4/6/134636509/09e1c0bd.pdf
    • https://cdn.sqhk.co/detazido/gcKhbji/takudutokugafajutubixuv.pdf
    • https://cdn.sqhk.co/wepenujofow/enTge9Q/poboy_shop_decatur_ga.pdf
    • http://yellownatural.space/english_grammar_test_pre-_intermediate_leveljpkfi.pdf
    • https://bativizamazon.weebly.com/uploads/1/3/4/7/134770744/a7c12ff.pdf
    • https://voloxamofe.weebly.com/uploads/1/3/0/8/130874475/lutigedem_fulafozifize_tibogin.pdf
    • http://markettop.pro/how_to_study_for_usmle_step_1_in_1_month1blj0.pdf
    • https://padokerasuwo.weebly.com/uploads/1/3/5/3/135319223/d6886cd10a582be.pdf
    • https://cdn.sqhk.co/lajoroteb/orDgeIS/cinergy_theaters_odessa_tx.pdf
    • http://kyhni.site/comforting_words_for_mournersespw3.pdf
    • http://magnifioco.site/dalaxepujijogapor45m92.pdf
    • http://freshnatur.fun/j_cole_apparently_piano_sheet_musiczhl27.pdf
    • https://fuvetowonilup.weebly.com/uploads/1/3/1/3/131383456/6361c0b6.pdf
    • http://xplaintome.ru/rezixobefapiweminudupeg3n.pdf
    • http://gouliwer.online/student_bmj_author_guidelines3sklu.pdf
    • https://jejepijukutu.weebly.com/uploads/1/3/4/1/134131362/7278243.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000c332.bin
f4bf761047be538c64fa85f95dc292562c1b048e5b12cce39f023591190a51ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC332 5392 bytes
font_01_sfnt_off0000d56a.bin
f6569f0b413fe73ca0a4a366141272737db7d81f2ee969ff65d646e0d9fdf93d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD56A 11176 bytes

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