Malicious PDF — malware analysis report

Static analysis result for SHA-256 abeedce0e82369c8…

MALICIOUS

PDF

108.4 KB Created: 2021-04-17 23:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 33fc086e0c194cabe1f77aca1df11782 SHA-1: e183f406739b262c5c7483b99aca3cfeb240fa7d SHA-256: abeedce0e82369c8433965eab951d36f57428fa6e28553669df6ede4b44073ac
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=is+it+possible+to+use+xbox+360+controller+on+xbox+one PDF link annotation
    • https://cdn.sqhk.co/ragebobeb/djdgfgi/ball_pipe_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/dikizumi/ehfH8ij/hattrick_cricket_factory_llp.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefima/h7OgcqW/las_vegas_hotels_price_comparison.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwopazeg/w9Miihj/bass_booster_youtube_pc_windows_7.pdfIn PDF document text
    • https://cdn.sqhk.co/manuguwe/Hhcihib/21357155873.pdfIn PDF document text
    • https://tunimesepet.weebly.com/uploads/1/3/1/4/131455680/tatunomigil-fixotanoxubot.pdfIn PDF document text
    • https://cdn.sqhk.co/tipekafomube/gdgfgdB/zivezirutetup.pdfIn PDF document text
    • https://cdn.sqhk.co/zodozane/cihgjgj/duzezak.pdfIn PDF document text
    • https://cdn.sqhk.co/vumorumuvogi/AVihxYM/onkyo_hf_player_2._5_1_unlocked_apk.pdfIn PDF document text
    • https://zefijevizo.weebly.com/uploads/1/3/2/3/132302816/0efe309243.pdfIn PDF document text
    • https://bubafoxir.weebly.com/uploads/1/3/0/8/130874260/mivusuzogiser_kebijila.pdfIn PDF document text
    • https://senidexug.weebly.com/uploads/1/3/0/7/130775540/lufolifawilofegoto.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwopaperuv/XijsHVK/gtr_traffic_rivals_hack_apk.pdfIn PDF document text
    • https://litunuvojiv.weebly.com/uploads/1/3/0/9/130969221/1e7bad907.pdfIn PDF document text
    • https://fefezotexarij.weebly.com/uploads/1/3/4/2/134265886/geliz_fowisekeli.pdfIn PDF document text
    • https://cdn.sqhk.co/patagarinixa/DPeidij/2757415015.pdfIn PDF document text
    • https://jevokave.weebly.com/uploads/1/3/4/2/134266272/fizam.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/fowikorejodi/attack_on_titan_season_4_release_date_netflix_singapore.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/45524440725.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/autocad_2007_crack_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/38147966823.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/32127244932.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F64 6760 bytes
SHA-256: dc0295a40e22a1bf78a32a909b88eb3f7d8b1a56974b2913d9043ab0f5198b5d
font_01_sfnt_off00013026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13026 5148 bytes
SHA-256: fad804a5f90b2d5813cf0bcb0cc65eba5cbcbe0cf130230546cd49c71820cd7e
font_02_sfnt_off000141db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141DB 5324 bytes
SHA-256: f0b00ec145f0923f81eca29cb6d8eeb090393c361b3e1c634c19aafbdb367584
font_03_sfnt_off00015404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15404 14340 bytes
SHA-256: 74c28a6b05054f89eed04146ef5f57de53f5e06e7397f25c0efae97a992e4bac
font_04_sfnt_off000181e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181E6 19120 bytes
SHA-256: 673406e2d6e2e509468fbc378d3fc5af105a21e4759bc95f487416ba8738460d

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