Malicious PDF — malware analysis report

Static analysis result for SHA-256 af838923ec08ebe5…

MALICIOUS

PDF

80.0 KB Created: 2021-03-21 00:53:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 9112ae7540da4adce216c156fc00a635 SHA-1: 288d050b292dcb50b1271eb868c6bd54e12503c6 SHA-256: af838923ec08ebe501385c48cc2681eb20e22062ac1a5e015c88b9e9862f7c44
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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/wix?keyword=similar+figures+and+scale+factor+worksheet+pdf PDF link annotation
    • https://peniluvemafoni.weebly.com/uploads/1/3/4/7/134705148/95951.pdfIn PDF document text
    • https://fetatoba.weebly.com/uploads/1/3/4/6/134689412/d5738898955f.pdfIn PDF document text
    • https://pexafibilo.weebly.com/uploads/1/3/4/4/134484824/guwakulazuziwu.pdfIn PDF document text
    • http://playmarket-online.com/vafinadililafixina95bm8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393754/normal_6047162ce2aee.pdfIn PDF document text
    • http://lnstagramlivesupportcenter.com/4445265304812ig0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506063/normal_6049b74f89dbb.pdfIn PDF document text
    • http://yildirimotobursa.com/what_are_the_best_short_story_collectionsbxuz3.pdfIn PDF document text
    • https://jadusulad.weebly.com/uploads/1/3/4/7/134764450/vajiwabimexe_wovoratovopara_talepezutu.pdfIn PDF document text
    • https://cdn.sqhk.co/menasimax/hijfhiq/top_100_games_on_steam_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/6hdigjb/calligraphy_fonts_free_marathi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453889/normal_5ff55f696ac19.pdfIn PDF document text
    • http://khareedforosh.com/did_a_mouse_run_across_the_floor_in_the_crown_season_4_episode_3hygal.pdfIn PDF document text
    • http://jumbochecker.com/488919707594rgyw.pdfIn PDF document text
    • https://cdn.sqhk.co/xalesikozip/igjdMif/safari_latest_version_for_windows_free.pdfIn PDF document text
    • http://vashmaster.info/66342602212y9t4w.pdfIn PDF document text
    • https://nerukime.weebly.com/uploads/1/3/1/3/131379394/7159858.pdfIn PDF document text
    • https://cdn.sqhk.co/bivuwusim/oCgY4hl/dc_dmv_test_answers.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://uploads.strikinglycdn.com/files/b5f80a8e-bd00-4f8a-b5f2-4d703fccd6f4/toward_a_psychology_of_being_by_abraham_h._maslow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6348acb8-5233-4e1d-9097-e9859d168184/human_geography_textbook_grade_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72a02b1a-1c61-4d6c-91cd-275936188fcd/my_dishwasher_leaks_from_underneath.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff00a31f-3e71-426b-85c9-dd5206929c2c/96499765653.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27fdbaca-5a95-407d-b044-65576477d3d0/does_vicks_warm_mist_humidifier_need_filter.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA3 5712 bytes
SHA-256: 2777dd679ab63abaa0e0bd5862012c7dec11f08e2856ec4b32a82e056c10c9d5
font_01_sfnt_off0000fde9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE9 10760 bytes
SHA-256: 3e1c81ae5ce5bce25999ca96babe57228b92d94d8e24b24b97e839f1fa246c9b
font_02_sfnt_off00012299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12299 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71