Malicious PDF — malware analysis report

Static analysis result for SHA-256 b13fe91eb0bd650d…

MALICIOUS

PDF

82.0 KB Created: 2021-05-21 16:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd5b56981f628742b0f7c5b7452eb639 SHA-1: 7f741d6f77503067bc9583f5856cff1d82c1c150 SHA-256: b13fe91eb0bd650d15c096d6c0f9ee823878b82d3fdfafedb070f4132e062e9a
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, identified as a link farm, with the primary URL suggesting a lure for downloading 'Among Us' mods. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external PDF links points towards an attempt to redirect users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=among+us+mod+always+imposter+ios+download
    • https://muduzefob.weebly.com/uploads/1/3/4/0/134018051/2871181.pdf
    • https://cdn-cms.f-static.net/uploads/4480187/normal_605d65b228c06.pdf
    • https://cdn-cms.f-static.net/uploads/4426063/normal_601c9b6fe10e7.pdf
    • https://zonarawe.weebly.com/uploads/1/3/4/0/134040860/e6c045.pdf
    • https://mubonunegaj.weebly.com/uploads/1/3/0/8/130874179/4552979.pdf
    • https://static.s123-cdn-static.com/uploads/4445331/normal_5fc964f574eb9.pdf
    • https://lilonukile.weebly.com/uploads/1/3/4/7/134767916/xujutusagoxusila.pdf
    • https://xomunulozesini.weebly.com/uploads/1/3/4/0/134018183/7929244.pdf
    • https://lezekuzog.weebly.com/uploads/1/3/1/3/131378913/wonadalezovevoxujife.pdf
    • https://cdn-cms.f-static.net/uploads/4473384/normal_602eaf2482f1e.pdf
    • https://cdn-cms.f-static.net/uploads/4379233/normal_602f7f3a74630.pdf
    • https://tapinizeguzuj.weebly.com/uploads/1/3/4/4/134456840/bisaniput.pdf
    • https://nutakiderovex.weebly.com/uploads/1/3/4/6/134622867/fumilo_fuxozit.pdf
    • https://rowopubogapog.weebly.com/uploads/1/3/4/2/134234702/minobane.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/91cd7efc-87fa-4612-bc82-c035a17bab9a/gutolowidetowuj.pdf
    • https://uploads.strikinglycdn.com/files/e54ee263-f2b6-4893-bc64-f07f52bf40d2/94982187608.pdf
    • https://uploads.strikinglycdn.com/files/e982c56d-42ab-4461-8b06-a05015af5627/84046424844.pdf
    • https://uploads.strikinglycdn.com/files/22aef4b4-90c7-4f34-b56d-ef95914e5e1d/35107974310.pdf
    • https://uploads.strikinglycdn.com/files/b22bddaa-437f-48bc-a4f7-f047391214bb/83087511102.pdf
    • https://uploads.strikinglycdn.com/files/53046703-1f40-4227-a161-7735153e29c5/dadikadagalozevarelazo.pdf
    • https://uploads.strikinglycdn.com/files/44a3ee41-cbe3-4d71-bdee-60e0985dd190/marbury_v_madison_defendant.pdf
    • https://uploads.strikinglycdn.com/files/d2ba88bf-af5d-4fd2-aff8-d91b28690891/westell_a90-7500_manual.pdf
    • https://uploads.strikinglycdn.com/files/b3ba2b36-26c8-49bd-862e-8d7b1af143df/suvedojezejani.pdf
    • https://uploads.strikinglycdn.com/files/30a44f61-aa4d-4334-a686-535f00b767df/fomefesiropifagiserixe.pdf
    • https://uploads.strikinglycdn.com/files/5e81f986-ecee-40aa-848c-73697704e43b/nerererapa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7cc.bin
6d7694a28987f38bdf89447c68ee3c524b16211bb1172406fb1813d955754ee3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CC 5464 bytes
font_01_sfnt_off00010a5a.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5A 1800 bytes
font_02_sfnt_off000112e8.bin
fbc9a04fef9e819af5786121cce06018aae2fefe75c824113e9f5008ddd4a467
pdf-font-stream PDF embedded font (sfnt) at offset 0x112E8 11380 bytes