Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ea1ed88152ad24…

MALICIOUS

PDF

78.2 KB Created: 2021-03-27 14:24:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 5f430187ca5373e71fb8fbdd438e0733 SHA-1: 216d15e18ac0b3e5d8f5034bfd718bf8979e12d3 SHA-256: a1ea1ed88152ad241cc020348a46a17038df1e86179f3e78576b5bf631dfb5b9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, characteristic of a link farm. The primary purpose appears to be SEO manipulation or distributing further malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/award?keyword=cost+accounting+questions+and+answers+pdf PDF link annotation
    • https://cdn.sqhk.co/bureruverog/ef6jagj/wardrobe_pocket_door_system.pdfIn PDF document text
    • https://cdn.sqhk.co/wefenosefob/bhiZy2p/rise_of_the_kings_wikia.pdfIn PDF document text
    • https://xamezorunag.weebly.com/uploads/1/3/1/6/131606231/pixesigoda.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/1hgRjgh/sheep_launcher_app_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/dexediwiboze/dsieJgj/arcade_games_for_home_bar.pdfIn PDF document text
    • https://rurasaza.weebly.com/uploads/1/3/4/8/134869927/ritumoxajudi.pdfIn PDF document text
    • http://mivukiwoluwuj.iblogger.org/mozart_lacrimosa_requiem_piano_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/guzoladip/hbZ1Hhb/bcom_entrepreneurship_and_business_management_jobs.pdfIn PDF document text
    • https://cdn.sqhk.co/sixepatexup/fqDib54/beast_quest_ps4.pdfIn PDF document text
    • https://nuxirudeduw.weebly.com/uploads/1/3/4/4/134442083/bawutebaxisad_vatomovik.pdfIn PDF document text
    • https://cdn.sqhk.co/ketegobuto/ivChfNM/human_centipede_2_movie_free.pdfIn PDF document text
    • https://cdn.sqhk.co/dasadogiso/igycgci/zutaruragarime.pdfIn PDF document text
    • https://cdn.sqhk.co/goropakuvoge/Yighgig/vezabubuzopapiposiwetida.pdfIn PDF document text
    • https://cdn.sqhk.co/mebereserab/hfhjghG/classic_tabletop_arcade_games.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/gedesisumi/67186547924.pdfIn PDF document text
    • http://levegukesiwus.rf.gd/manager_accounting_software_guide.pdfIn PDF document text
    • http://bewaxupu.rf.gd/sawipol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a3a6afa-d1d4-4634-a823-80fdfd427a40/gelupazasekopapaxoke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d97fabf9-0bbf-4b05-9dc0-c39185f47fa1/52700392379.pdfIn PDF document text
    • http://zobotidagulipu.epizy.com/42544251233.pdfIn PDF document text
    • http://lebozid.epizy.com/pemumem.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/anjali_anjali_pushpanjali_song_in_masstamilan.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_off0000f4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A0 5412 bytes
SHA-256: 1b91f681993b1aeb69e92127c9e81608fbed61cc59ae2675af11e9834ed6e7dc
font_01_sfnt_off0001071f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071F 10620 bytes
SHA-256: 42c66ff8054789bc524c0db66182750815d57e03d22c285976cf37077791059d

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