Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c84cacf6dc28ae3…

MALICIOUS

PDF

146.1 KB Created: 2021-03-09 04:59:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 74da38d2aa73c976d6bffa52f0b14025 SHA-1: 449699c15624b7452d5071e1e97e112536715df4 SHA-256: 9c84cacf6dc28ae3035f67fc97ff25d094ed8ec599a064b2a0fe1babc8d4c611
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious content designed to redirect users.

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://bologen.ru/wix?keyword=rhetorical+modes+definition PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4390637/normal_5fdfacc424dcd.pdfIn PDF document text
    • https://nogomikosisodop.weebly.com/uploads/1/3/2/6/132681488/6362531.pdfIn PDF document text
    • https://segamivudafipem.weebly.com/uploads/1/3/2/7/132740242/d81ca6e46d4.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/WT6s8CB/webiwaxakowudot.pdfIn PDF document text
    • http://huseyincanx.com/how_often_to_use_pmd_microderm6ffbn.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/aKggijd/the_whipping_boy_summary_shmoop.pdfIn PDF document text
    • https://cdn.sqhk.co/dizukenepu/dgcgdif/12688591069.pdfIn PDF document text
    • http://paktum.pro/reading_comprehension_strategies_for_middle_school_studentsvmbnw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447278/normal_5feba1087a70a.pdfIn PDF document text
    • https://cdn.sqhk.co/vemunaxudug/ifVjcIF/maruti_suzuki_swift_dzire_front_shocker_price.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/jhi5ou4/knife_hit_wiki_fandom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390637/normal_5fdfac8da852b.pdfIn PDF document text
    • https://menufaron.weebly.com/uploads/1/3/0/7/130775522/xekoxoxiwojo-kutupojepapibep-xuvel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468274/normal_5fdf498a364bb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xajowu/b._ed_admission_form_2019_haryana.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/casio_g-shock_gg-1000-1aer_mudmaster.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/2002_ford_explorer_starter_replacement_cost.pdfIn PDF document text
    • https://fd0ef26f-7b8f-4c91-b3b2-19f7ec93487a.filesusr.com/ugd/4174bf_317102c7d33944d29282a9fe95dd771b.pdf?index=trueIn PDF document text
    • https://39472683-7d43-4bc3-882b-0947a83fd973.filesusr.com/ugd/544c7e_30f44c0b4f4e49508e5fdc18a5657825.pdf?index=trueIn PDF document text
    • https://a49aa754-465e-4bbd-924e-b3d0e7b66bd4.filesusr.com/ugd/81d6a4_542da94d95a24ef38e9d4219bac28ecb.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_off0001f7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F7EE 5056 bytes
SHA-256: 5ed780441dad5c95b377a600816e8fa767467a42a86a01bef791e32233a84b4d
font_01_sfnt_off000208f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x208F0 10364 bytes
SHA-256: 206aeef378ce9570ed325be06187600c6d3baf09fa9c5f9b6675599540242622
font_02_sfnt_off00022c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22C5A 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361