Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2062f9a2639e56e…

MALICIOUS

PDF

100.0 KB Created: 2021-04-20 04:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00976228d5a5f9ad8eccce469e657c64 SHA-1: b899dbf3298d34c582cd2f7468e87a2dfef711d8 SHA-256: f2062f9a2639e56edc7ecd7e54e4d4738cbe23747c1574517164c6afe391c396
186 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 hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier also indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs strongly suggest it's designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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-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://kuzutuzo.ru/strik?utm_term=finding+missing+angles+worksheet+answer+key
    • http://pexarinolal.mypressonline.com/gepijivoperubedat.pdf
    • http://fikosarodone.medianewsonline.com/53057324317.pdf
    • https://vufuvato.weebly.com/uploads/1/3/4/7/134718288/995279d.pdf
    • http://lunagogafoxoj.sportsontheweb.net/penyebab_alkalosis_respiratorik.pdf
    • http://granitmetrospecstroy.ru/530367543379r5m.pdf
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/wubumoreguli.pdf
    • https://sasofisapen.weebly.com/uploads/1/3/4/5/134590640/2870462.pdf
    • http://wosozage.mypressonline.com/97408908878.pdf
    • http://ch-redirect.icu/intermediate_microeconomics_nicholsonmbap7.pdf
    • https://guxofoxevi.weebly.com/uploads/1/3/4/7/134737998/kuzefudebik.pdf
    • http://13millions.store/xuxokekaminelolixuawt0n.pdf
    • https://vonojatu.weebly.com/uploads/1/3/4/7/134711894/a9d74a345f416.pdf
    • https://lamixanusagexog.weebly.com/uploads/1/3/5/3/135317293/saxovuf_bikirukimolelu_tunepumexulima.pdf
    • http://jofufunobek.sportsontheweb.net/74720246470.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mogixos.atwebpages.com/blockchain_in_banking.pdf
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_560888fcddb14b188e545bb3d1bef36a.pdf?index=true
    • https://6d0c6d30-55b9-4b7f-8145-34d11b484ddf.filesusr.com/ugd/8db56d_44e382934f1842fd85aab51d9308bfbb.pdf?index=true
    • https://e40da922-b0e4-44be-9878-2d4898ccab21.filesusr.com/ugd/3a38e0_5680a0db4df34582a90a127f648b15b8.pdf?index=true
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_c8542b0ebc774203acaa58643fbbfa86.pdf?index=true
    • http://bidajalej.onlinewebshop.net/fugekolatewaletolemas.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012081.bin
30a8a72da129ddb3155cb13f629d892d05dd0a7e30c5a9288892f0021866b996		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12081 3080 bytes
font_01_sfnt_off00012b7d.bin
197c7618f7f0aef2577e8d707c81bc783e3cf8e2e90ffba98b3248e94ed9b0c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7D 5452 bytes
font_02_sfnt_off00013df4.bin
da916d490decee038dab1661ab124d5869d0009a51021f71470805108c82c4c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF4 13940 bytes
font_03_sfnt_off00016cb2.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16CB2 16204 bytes

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