Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2a99e78770eef42…

MALICIOUS

PDF

83.4 KB Created: 2021-03-11 15:40:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 136b6c5a8f8f1817b38f9d0730188ab8 SHA-1: 5dc81ef98041216d1e03dd25dc15d26721707852 SHA-256: c2a99e78770eef42eff76d4fc1bd1e1e0eea6b995091fb6470e55c2e01d65d51
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 0.9993

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://botokaw.ru/award?keyword=naming+acids+and+bases+worksheet+pdf PDF link annotation
    • https://sefomaxezaniv.weebly.com/uploads/1/3/1/4/131483109/9309627.pdfIn PDF document text
    • https://cdn.sqhk.co/zipirevofu/4hghhii/56066589651.pdfIn PDF document text
    • https://gawofatofuwe.weebly.com/uploads/1/3/1/3/131380275/xogexovubunufoduna.pdfIn PDF document text
    • http://zesegalos.scienceontheweb.net/briggs_and_stratton_push_mower_oil_drain_plug.pdfIn PDF document text
    • https://cdn.sqhk.co/titesojijuko/9iahfgd/julejirulipeza.pdfIn PDF document text
    • https://cdn.sqhk.co/xovatapegil/ghRJjc8/magic_earth_navigation_maps_opinie.pdfIn PDF document text
    • https://gopopozemilin.weebly.com/uploads/1/3/0/8/130874381/6950465.pdfIn PDF document text
    • https://wimelavejitovuv.weebly.com/uploads/1/3/4/5/134597731/7832767.pdfIn PDF document text
    • https://ximewenidurap.weebly.com/uploads/1/3/4/6/134651426/gufusuvavuwemeja.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/j6viija/galaxy_watch_active_2_vs_gear_3.pdfIn PDF document text
    • https://bevabuje.weebly.com/uploads/1/3/4/8/134897483/6263137.pdfIn PDF document text
    • https://sepiboberad.weebly.com/uploads/1/3/1/1/131164555/250aba8a00d8b.pdfIn PDF document text
    • https://figuzejigof.weebly.com/uploads/1/3/4/6/134644002/fasepadil.pdfIn PDF document text
    • https://cdn.sqhk.co/vidoperife/gRaijgf/23391543605.pdfIn PDF document text
    • https://guvoladedesu.weebly.com/uploads/1/3/1/4/131453897/women_wutaki.pdfIn PDF document text
    • http://nitanupemil.mygamesonline.org/48517451740.pdfIn PDF document text
    • https://kenazago.weebly.com/uploads/1/3/1/0/131070597/7268835.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bupijila/papogovepefezujolomepatus.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/ableton_reference_manual_version_10.pdfIn PDF document text
    • http://wupaxozejite.rf.gd/freelance_work_agreement_template.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/xogegox.pdfIn PDF document text
    • http://lexulegoserixa.epizy.com/how_do_i_reset_my_voicemail_pin_on_a_cisco_phone.pdfIn PDF document text
    • http://zawiwupo.epizy.com/audio_from_video_link.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/benign_prostatic_hyperplasia_guidelines_uk.pdfIn 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_off00010137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10137 5800 bytes
SHA-256: 519bfbc356d122b018021510013a6b66943c9e73c1a5022d2e1187d3259e7a08
font_01_sfnt_off000114e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E6 13764 bytes
SHA-256: 5a67883ff6f9ffb2978019d4f26ce95d6103f62ba353dd3f58774636e4fb404b

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