Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb0729c495a6c4aa…

MALICIOUS

PDF

90.9 KB Created: 2021-03-16 09:25:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3a0b1df0319384357e7b05a3884a8518 SHA-1: 992d5cd2e5f6cc464c31bc0e490650c944f6272c SHA-256: fb0729c495a6c4aa8f7446349bf6beb2f6698ebd437aa260df40febbea43901e
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://xajibur.ru/wix?keyword=moedas+americanas+como+identificar PDF link annotation
    • https://cdn.sqhk.co/xolilipedeko/cUgegjW/bandpass_speaker_box.pdfIn PDF document text
    • http://milatepe.medianewsonline.com/differential_calculus_application_problems_with_solutions.pdfIn PDF document text
    • https://cdn.sqhk.co/pevelefotuve/ghylTje/55009926024.pdfIn PDF document text
    • http://presalle.xyz/spotify_premium_free_songs_iosfgx3d.pdfIn PDF document text
    • http://ionatr.fun/zumajoxexutawodaghze2.pdfIn PDF document text
    • https://cdn.sqhk.co/rojisixel/ibhesdS/ben_newsam_co_uk.pdfIn PDF document text
    • http://redpandarecycling.com/how_to_use_an_innova_3020mep56.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/WW0K8gi/coin_counter_bank.pdfIn PDF document text
    • http://ita-yog.space/48793967095f6kxj.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvomuvugu/argjpld/jenaxevezujimoxozadusoxaf.pdfIn PDF document text
    • https://cdn.sqhk.co/golemejexeno/0Qr74jd/kokivumexivu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a082fd4-e93f-4b8e-9e59-408fa046b31c.filesusr.com/ugd/e334dd_636443a9e3e6447d9ba183c17e3cde8e.pdf?index=trueIn PDF document text
    • http://rojanesifilagu.myartsonline.com/code_name_verity_summary_part_1.pdfIn PDF document text
    • https://74bb8966-1fc2-43cb-a641-24c20f380d28.filesusr.com/ugd/84c7b5_3606dc6ce43e4f44aaac58611ca86399.pdf?index=trueIn PDF document text
    • http://livirava.atwebpages.com/is_a_2012_hyundai_sonata_hybrid_a_good_car.pdfIn PDF document text
    • http://vilumepidiwego.myartsonline.com/lerikugawuka.pdfIn PDF document text
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_6d88654d5ff4420390ec5c59178a9c6e.pdf?index=trueIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_198c48bde93f4446bb20a2485a2dd020.pdf?index=trueIn PDF document text
    • https://0ca12155-7937-4926-a9d0-23a43aecd1f4.filesusr.com/ugd/d55797_efd678e58cfe4578a99cff1f30a4d473.pdf?index=trueIn PDF document text
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_6d5f790045f240ef9a5bb0eab5ff996d.pdf?index=trueIn PDF document text
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_efc9e2644dcf429281994425ba5d702c.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11820 5140 bytes
SHA-256: 6992d248806d04a730fda791f58dc60bddfb5e29e73e62fb6832dd0f019a1735
font_01_sfnt_off00012986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12986 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00013214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13214 13824 bytes
SHA-256: d08ac089eacedf07f66eee2f6a673f65b37b0b2534dfaa9eaf9f95debc07d5fd