Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6544d3e947ab5e9…

MALICIOUS

PDF

78.7 KB Created: 2021-03-22 03:24:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 96c0c85e4b80a2336e2454911df8df64 SHA-1: 51a298605b655a63223e6ea87804f338510fd143 SHA-256: b6544d3e947ab5e939bfb1d94b15d7c50e80834f4b67ff25433070cb96e3a013
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 0.9961

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://golowaki.ru/wix?keyword=every+shot+counts+mark+broadie+pdf PDF link annotation
    • https://tuvopezape.weebly.com/uploads/1/3/4/7/134712323/romubowebidosu_purufuleroru.pdfIn PDF document text
    • https://cdn.sqhk.co/tupulezi/ghiagfV/81975433936.pdfIn PDF document text
    • https://wenojobopowegit.weebly.com/uploads/1/3/4/8/134879608/4360781.pdfIn PDF document text
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/5229436.pdfIn PDF document text
    • https://cdn.sqhk.co/vemunaxudug/dSihhgo/2028599193.pdfIn PDF document text
    • https://zisamezasebav.weebly.com/uploads/1/3/3/9/133997726/gifol-mirije.pdfIn PDF document text
    • https://wowavimisaken.weebly.com/uploads/1/3/0/8/130814021/97a6c282f513.pdfIn PDF document text
    • https://cdn.sqhk.co/soziwariru/hitijic/maruti_swift_dzire_shocker_price.pdfIn PDF document text
    • https://tuwoganerolet.weebly.com/uploads/1/3/4/6/134631505/nonilerujozeso_wibuwo_zitovipipijimi_vufapata.pdfIn PDF document text
    • https://kazowotamije.weebly.com/uploads/1/3/4/0/134012594/tufexobipef.pdfIn PDF document text
    • https://cdn.sqhk.co/vafegijateno/ehdTicd/smartthings_device_status_offline.pdfIn PDF document text
    • https://rufogeror.weebly.com/uploads/1/3/4/6/134664275/46545c.pdfIn PDF document text
    • https://fafenerukore.weebly.com/uploads/1/3/1/3/131398145/4c7f9e4afb3d941.pdfIn PDF document text
    • https://cdn.sqhk.co/puwokiraf/ZhjjapF/cabinet_manual_rwanda.pdfIn PDF document text
    • https://cdn.sqhk.co/bomemenun/hihyshh/card_creator_fut_19.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/jcThihe/sapoxipojuvemora.pdfIn PDF document text
    • https://mujolimu.weebly.com/uploads/1/3/4/8/134868529/gemamenukefuga.pdfIn PDF document text
    • https://rifejirofedum.weebly.com/uploads/1/3/4/7/134763588/e8b843.pdfIn PDF document text
    • https://cdn.sqhk.co/kifukuvitog/jilPhgT/ruxivunafuwisim.pdfIn PDF document text
    • https://cdn.sqhk.co/punipopi/iiuCVid/master_crafting_and_building_apk.pdfIn PDF document text
    • https://reponobokuwe.weebly.com/uploads/1/3/5/4/135401207/3168727.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/9Rx2hiW/patodaruwax.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/zarusegibitumet/diferencias_entre_anestesia_epidural_y_raquidea.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/14989756176.pdfIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/wemurirutukirogatal.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/rutuvoxinomapinif.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/ginusizonajakubaluzanezaz.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_off0000f300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF300 5684 bytes
SHA-256: de7a0b40535e0781cc5ea224a0fd8258f245f0138cfd686bec7e044a56e54f94
font_01_sfnt_off00010639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10639 10976 bytes
SHA-256: d7015b32b35c0c269e0c66bbb2bb8e4f494648fb3b51432483449d4996ba02ec