Malicious PDF — malware analysis report

Static analysis result for SHA-256 023fdaaa990853cf…

MALICIOUS

PDF

80.8 KB Created: 2021-02-28 18:43:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 3efa5b4d1e8222bf0eab75136d388a71 SHA-1: 0544183f96f50ac4315209f4e6e45b569d3b07f9 SHA-256: 023fdaaa990853cf483bfc2aed76057d97a8b5f2806a6a6e1d75d0af0595c990
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, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely related to SEO manipulation or directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/strik?utm_term=are+watch+straps+interchangeable PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382973/normal_5fd61218abfd1.pdfIn PDF document text
    • http://pogetukexuk.66ghz.com/65563102141.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423171/normal_6026536758152.pdfIn PDF document text
    • http://fusagawi.iblogger.org/lavufolivanobiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448558/normal_600bdd389f888.pdfIn PDF document text
    • https://baxugufidet.weebly.com/uploads/1/3/0/7/130776886/6954766.pdfIn PDF document text
    • https://fusidaxeda.weebly.com/uploads/1/3/1/4/131453850/dceb39f.pdfIn PDF document text
    • https://jogemubo.weebly.com/uploads/1/3/4/3/134321321/dedofununidulovifun.pdfIn PDF document text
    • https://cdn.sqhk.co/moxoxitij/jcnHhex/video_call_from_cartoon_cat_at_3am.pdfIn PDF document text
    • https://cdn.sqhk.co/jabuvilir/cfuPZjj/dress_up_games_school_girl_fashion.pdfIn PDF document text
    • https://revugegan.weebly.com/uploads/1/3/4/6/134682990/nadat.pdfIn PDF document text
    • https://peliwotamo.weebly.com/uploads/1/3/5/3/135325711/2969677.pdfIn PDF document text
    • https://xoxajunun.weebly.com/uploads/1/3/4/3/134351876/sewupiwilelu-rujin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407318/normal_5ffa071b70043.pdfIn PDF document text
    • https://cdn.sqhk.co/podoxato/Mhgjfhh/unfair_rage_platformer.pdfIn PDF document text
    • https://kuruxeronujupo.weebly.com/uploads/1/3/4/4/134477992/wabemew-xikenubusomo.pdfIn PDF document text
    • https://cdn.sqhk.co/jomububorava/jazgerT/56065162331.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vewomani.rf.gd/formal_ways_to_address_in_spanish.pdfIn PDF document text
    • http://xekokopadupino.rf.gd/misbehaving_thaler_review.pdfIn PDF document text
    • http://wotofuwib.epizy.com/what_happens_if_a_country_breaks_international_law.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99A 5416 bytes
SHA-256: df4603ed49b96ef265e3299b06c652a9da62ec41b9be4004d735517acf89a38b
font_01_sfnt_off0000fc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0B 10608 bytes
SHA-256: 1cbc86258904b0847fa29644c3d97bd40678f4f09624552eb959eaf99ab68bc9
font_02_sfnt_off0001205e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205E 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449