Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77275aaa670198a…

MALICIOUS

PDF

71.5 KB Created: 2021-03-22 00:03:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4944f32ed960d376a339e6cf5adbb98b SHA-1: 2116329d773dbf3790346d8ce0d2ed754510b8c2 SHA-256: f77275aaa670198a28bc093a89c3047e614b2abf17d69c54f2bd296521a1b396
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common tactic for SEO manipulation or to distribute malicious content. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as a phishing/trojan. The embedded URLs suggest a potential redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/wix?keyword=our+lady+of+the+assumption+church+bronx+new+york PDF link annotation
    • https://mivagadak.weebly.com/uploads/1/3/4/5/134599435/wolodafe.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxolusufa/jvQhb4G/jetpack_jump_crazy_games.pdfIn PDF document text
    • https://cdn.sqhk.co/vusanutoj/mghAy8t/gufutasanodevozus.pdfIn PDF document text
    • https://cdn.sqhk.co/wesebewoweva/Nbig3jc/affordable_emergency_vet_care_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/sesexibanobu/9JidEEx/zerejibafigobe.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/zamegegopoximiro.pdfIn PDF document text
    • https://cdn.sqhk.co/jekuzedu/jbiEiii/vejegumirafotaxagobilo.pdfIn PDF document text
    • http://jasazotinalol.mygamesonline.org/what_are_dark_sayings_of_old.pdfIn PDF document text
    • https://cdn.sqhk.co/ratijojitud/ehfMTz0/96092050286.pdfIn PDF document text
    • https://jukaninigureze.weebly.com/uploads/1/3/0/7/130738482/dotukololeludaloj.pdfIn PDF document text
    • https://xiwabedosebu.weebly.com/uploads/1/3/1/3/131398066/gidepo.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/CBzRJjj/4831920716.pdfIn PDF document text
    • https://cdn.sqhk.co/fimegasaz/3Wic7wD/14026529171.pdfIn PDF document text
    • https://cdn.sqhk.co/xerolunem/ignpmsT/father_and_son_barber_shop_hurth.pdfIn PDF document text
    • http://ketaton.mywebcommunity.org/como_desapegarse_sin_anestesia_walter_riso.pdfIn PDF document text
    • http://jezonikiroka.mygamesonline.org/10787628557.pdfIn PDF document text
    • https://muwewixobajigu.weebly.com/uploads/1/3/4/3/134312624/3074341.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/sepawi/57024434481.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/muscle_mass_workout.pdfIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_c75876f073644e5c82437d500e1bb099.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/42919155844.pdfIn PDF document text
    • http://nakixaxev.myartsonline.com/body_dysmorphic_disorder.pdfIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_0dbce994b0b34c96b4699b936b10efa2.pdf?index=trueIn PDF document text
    • https://06e27459-8a58-4d01-a48e-f853eab966f6.filesusr.com/ugd/55f1a0_e686a1084bba4430b81862680a6ea2cf.pdf?index=trueIn PDF document text
    • https://044ec7df-721b-4788-b209-87474a3fcb06.filesusr.com/ugd/60ffa2_e99915afefe04c95a45eda0ed590b6cc.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86A 5888 bytes
SHA-256: 29257d2b72df5e55bacaad1389a4bb3b23ac8ee3e208bfb510e581984a1561b9
font_01_sfnt_off0000ec5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5C 10500 bytes
SHA-256: f3586990b80e48b0d0277e96a43b75c8971338ca99f0e45e7a18c10557029d00