Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc0fa2135e5c378d…

MALICIOUS

PDF

140.9 KB Created: 2021-03-11 18:20:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 857d39cb78bddbeee72b872a4096e3db SHA-1: 816af11886a61848802f02748be79f64b3e5efdf SHA-256: fc0fa2135e5c378d76e7984f7669b4f2323d03fb0eb4328aa44f009bc269bcb0
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a large number of external links, many pointing to disposable hosting. The primary URL suggests a lure related to search terms, indicating a potential SEO manipulation or phishing campaign. ClamAV and ML classifiers strongly indicate maliciousness, likely related to exploiting PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://zajinet.ru/strik?utm_term=22+jump+street+poem+slam+lyrics PDF link annotation
    • https://keduwiwisa.weebly.com/uploads/1/3/4/4/134486116/dujabuzedi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408346/normal_6040a548a74ba.pdfIn PDF document text
    • https://lenapejasuma.weebly.com/uploads/1/3/4/7/134749539/4106087.pdfIn PDF document text
    • https://fuzewero.weebly.com/uploads/1/3/4/3/134393775/nuvakadew.pdfIn PDF document text
    • https://dutosagow.weebly.com/uploads/1/3/0/7/130775111/pudivogenuzi_wenamol.pdfIn PDF document text
    • https://topizamo.weebly.com/uploads/1/3/4/4/134435864/d5dd0e4a30c215.pdfIn PDF document text
    • https://zutizogemene.weebly.com/uploads/1/3/5/3/135348028/40c8248ee.pdfIn PDF document text
    • https://pisubemiduburor.weebly.com/uploads/1/3/1/3/131380627/181552.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485572/normal_6008e0d641063.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463034/normal_60123e8dbe001.pdfIn PDF document text
    • https://vosojexurixug.weebly.com/uploads/1/3/1/0/131070535/jazoxoni.pdfIn PDF document text
    • http://xabisafeb.22web.org/rgb_color_chart_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pojinagogaj.rf.gd/fudanidedalixiwugisebu.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/18524581747.pdfIn PDF document text
    • http://sulojigemijat.rf.gd/verobunil.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/emulationstation_theme_pack.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/card_games_solitaire_spider_free.pdfIn PDF document text
    • http://supisozireb.rf.gd/22_clues_level_18.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/mdu_date_sheet_reappear_6th_sem_2019.pdfIn PDF document text
    • http://jadupapobixe.epizy.com/kptevta_application_form.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_off0001ef66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EF66 5292 bytes
SHA-256: 27d6ae1c436297a8a0b0f611486c22b112276c12c0e397c1981de55eb2ed5fdb
font_01_sfnt_off0002015e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2015E 10508 bytes
SHA-256: d62a33e5787909d74c654921c60066d5cfc59945b4ef5adbf264d0b5e0e970b9

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