Malicious PDF — malware analysis report

Static analysis result for SHA-256 83dca77a77be3eb8…

MALICIOUS

PDF

77.8 KB Created: 2021-03-29 06:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 71d575abea6d3de9b97a915d1a203e79 SHA-1: 9941053359c67b9b09854c86ccc670edcf252f8d SHA-256: 83dca77a77be3eb85feec6c2f4059e0830b2782add27455b6cd7b929c2d764e2
166 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious distribution attempt. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' strongly suggests the document's purpose is to trick the user into believing they need a password to access an archive, a common tactic to bypass security scanners. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://dugedepap.ru/aws?utm_term=star+wars+blueprints+poster PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383147/normal_5fe81f1a2fe2f.pdfIn PDF document text
    • https://cdn.sqhk.co/nowagenika/jiwgh7m/josamimugedemasovabu.pdfIn PDF document text
    • https://cdn.sqhk.co/tategupet/jcdjiWH/12069419444.pdfIn PDF document text
    • https://cdn.sqhk.co/puzusagilem/reiggiw/manual_butterfly_valve_symbol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417807/normal_6028684109d28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384304/normal_604aa3184ab23.pdfIn PDF document text
    • http://sapapubusil.22web.org/banudopaxojuvogamuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415334/normal_60175d688edd4.pdfIn PDF document text
    • https://cdn.sqhk.co/levuzivanu/wtJhiid/entrepreneurship_skills_training.pdfIn PDF document text
    • http://joraxabe.iblogger.org/xisem.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/jfidVYL/capstone_course_an_introduction_to_the_cm_profession.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_0679b7429fc54763a4986c643fafdb42.pdf?index=trueIn PDF document text
    • http://sulozikimi.epizy.com/sederaje.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/xapiregika.pdfIn PDF document text
    • http://fotiworoz.epizy.com/betoremudutivuv.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/ff14_fishing_guide_70-_80.pdfIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_9fcbb2ebe1c94fdab4d2103d6015807c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/south_african_afro_pop_songs_2018.pdfIn PDF document text
    • http://lojogonofar.rf.gd/thinkpad_t430_drivers_windows_10.pdfIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_aa170eebf82347ae9386bacb1b714df5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/karcher_pressure_washer_lance_connector.pdfIn PDF document text
    • http://kesajuwigiferu.epizy.com/35718993000.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/3175342107.pdfIn PDF document text
    • https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_77528aba93ab40e3af2dd110f21b2b70.pdf?index=trueIn PDF document text
    • https://2b12d24f-0c9a-4a32-b427-430aba395f0c.filesusr.com/ugd/6cfe90_ab99099d6b844e88be93e5d8c7a191f4.pdf?index=trueIn PDF document text
    • http://pilomewolax.epizy.com/duluxifidiwejivo.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_off0000ef5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5D 5148 bytes
SHA-256: 8845f5be6e5e061883cc5a01cc8a8efa59ea395ab0f3df63b560d0636e5d77cf
font_01_sfnt_off000100f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F7 11776 bytes
SHA-256: 589d9ae8779027278c190a91431ee6a1bf99384a47c75d83e3e060cd5100efc6