Malicious PDF — malware analysis report

Static analysis result for SHA-256 401903cc422a6745…

MALICIOUS

PDF

80.7 KB Created: 2021-04-13 22:40:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3894dfa14e8c7527ec99aa999c7a1a5f SHA-1: 78e61b9ce107328bc0fcb20e08c79db63d1e479c SHA-256: 401903cc422a6745c685ad72f3eeecf1838581eafebc7b22e8617e861d3a23bc
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, indicating it functions as a link farm. The presence of multiple disposable hosting domains and UTM parameters suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://baarspo.ru/strik?utm_term=lights+out+podcast+joel PDF link annotation
    • https://cdn.sqhk.co/riketumes/hgeZjeO/magikarp_jump_support_pokemon_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/wemerofada/9MHjeaA/closing_the_gap_performance_report_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/hdhazbj/shopping_list_for_vegan_keto_diet.pdfIn PDF document text
    • https://cdn.sqhk.co/senuziker/dhgjiht/43574859363.pdfIn PDF document text
    • https://cdn.sqhk.co/rixutixim/geigoX7/steelseries_neon_rider_ebay.pdfIn PDF document text
    • https://cdn.sqhk.co/femokuxajuz/hcoihXs/swot_analysis_external_opportunities_and_threats.pdfIn PDF document text
    • https://cdn.sqhk.co/gisatajofo/n7ghjeb/67082480222.pdfIn PDF document text
    • https://cdn.sqhk.co/kokojisip/Jjajeih/derailed_commodity_flooring_furniture_independence_ks.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/jbhaOgc/21387959025.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f803bf1b-e1c2-47f6-a41f-c9785c88fbd4.filesusr.com/ugd/bf07b1_51a42df176bb4e2d97bc3192ca274052.pdf?index=trueIn PDF document text
    • https://02274cc9-8b57-4441-be19-e46c089ec46b.filesusr.com/ugd/f11b8f_5ea73c19258e499c8029e8e80ab6f411.pdf?index=trueIn PDF document text
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_0dd967c4d2de45309e1bd150ea2e42a6.pdf?index=trueIn PDF document text
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_f54cb49823054e14ac983791439e23fe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/nuwidedubifaw.pdfIn PDF document text
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_463f93249757481db6ebd5265aedca9d.pdf?index=trueIn PDF document text
    • https://0524119b-9543-44d4-a9c1-6a2a85ae2681.filesusr.com/ugd/b12506_41dc03680edd4e01aad1ba6f758bd212.pdf?index=trueIn PDF document text
    • https://d2dfa290-817f-4efc-a83c-a222e5544ac7.filesusr.com/ugd/954c8b_6a4ea6cd4b344b07b64e3deb139d2ded.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/setigafat/lifadonajarek.pdfIn PDF document text
    • https://8a833fea-7c9a-4d2e-a5a7-d3590f42a3e5.filesusr.com/ugd/9aab09_f6a3f3f58ce941be8dd2d1ed58b11d95.pdf?index=trueIn PDF document text
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_53da68a036824d5d9c374a13040b69d3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gazitif/ceragon_ip20_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/52713575453.pdfIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_de72a0360a6945ec9c3fe3938894d587.pdf?index=trueIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_b554f038af594ee4b1bb2dbaef7bcb2c.pdf?index=trueIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_73d8ee3e2ce6427691ba085f6bff0d96.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/98492699625.pdfIn PDF document text
    • https://15319a82-8c66-4906-b3c2-464277991f2b.filesusr.com/ugd/070acf_0570802b11064f24a0924140fce03f98.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD09 5256 bytes
SHA-256: 8b5e66b56e51a07fbbf48f94473e3cb9fbd02f4a54763e91a7f6ad8ed492cd98
font_01_sfnt_off00010ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF8 10612 bytes
SHA-256: c65d94d2fae61e42284d3ad5479690e6ac8bf0cd034a6b0ac303b42325a0ed01

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