Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f668dde2ec9a94…

MALICIOUS

PDF

104.2 KB Created: 2021-03-28 19:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 20cefc618eae60cb0879183db249bd86 SHA-1: b1ba25299ba5e09cd05c7916566e1d0b33107a12 SHA-256: f5f668dde2ec9a949e8f01ea6ad5d848fe44d897e3f1966516797df8ad2bec8a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, indicative of a link farm designed to attract search engine traffic. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this is a SEO spam campaign. The ML classifier and ClamAV detection confirm the malicious nature, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. While no scripts were directly extracted, the nature of the links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://xajibur.ru/award?keyword=japanese+books+for+beginners+pdf+free+download PDF link annotation
    • http://linodogeb.scienceontheweb.net/autocad_commands_with_example_free_download.pdfIn PDF document text
    • http://votixibutiro.medianewsonline.com/witapikakujoked.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/ijiiogj/pizopun.pdfIn PDF document text
    • https://cdn.sqhk.co/sikereri/ifShajj/palexuvugoluzigelusevude.pdfIn PDF document text
    • https://cdn.sqhk.co/lukisebeka/v8hdjeg/kefewoxaralolikotaro.pdfIn PDF document text
    • http://kafidovomiguvo.mywebcommunity.org/lowovugaxabunewubepisopo.pdfIn PDF document text
    • https://cdn.sqhk.co/padasagam/PSidjiT/rush_hour_shift_game_rules.pdfIn PDF document text
    • https://cdn.sqhk.co/divojimo/gct6hbs/cal_fire_uniform_t_shirts.pdfIn PDF document text
    • https://cdn.sqhk.co/zujumatatub/ghjaEmi/wolo_dixie_horn_sound.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/EihPiiL/wood_cutouts_yard_decorations.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuzolegogi.atwebpages.com/mutexapenufegarajuboganep.pdfIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_49af82fcbc8a4388abc326e12f944324.pdf?index=trueIn PDF document text
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_2a86532c3f594f2384efdf2c2ec289bd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d06e450-759c-4579-bab4-b478f150e9b2/98770730822.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da5251fe-f583-4a75-8813-1dfc459ae025/56991652346.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a32147e5-fb0e-42b8-94c2-08471ff1bdac/86008259567.pdfIn PDF document text
    • http://gudugapapilile.atwebpages.com/wakupuzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0f4eb71-d339-42ae-aca8-e2ce5b1ca453/dance_music_playlist.pdfIn PDF document text
    • https://b724dda4-e2e0-47c5-811c-ae3b7273578b.filesusr.com/ugd/a1e5ee_4a8239828689437c99ad13f4c5eebae4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3957cfe-0e2f-4fba-a399-b6e5c4bff5a9/48279548565.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9675291b-32e0-4a5f-911c-c9ee009fb92b/lekoso.pdfIn PDF document text
    • https://377d1c6c-8747-407e-9a0d-bb8234813250.filesusr.com/ugd/f0b1fd_f511209b88c14e81925e50f0ece2cb2d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7556da2-3c5d-4148-b072-986246827517/54792581986.pdfIn PDF document text
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_e08aeaff47b547c5b50bbe5837e0a33f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001152e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152E 20660 bytes
SHA-256: fe618455389ea008380a6d1f1cd79d2df09cd9563112f5c6505767c9febc00ce
font_01_sfnt_off00015752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15752 5492 bytes
SHA-256: a22c16ed1b73e532b696243942427520488fff3e741fe818003d71fa5f19beac
font_02_sfnt_off00016a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A23 11432 bytes
SHA-256: a375e1257061d09ff77c83c3c512f70033d1a8c166ae30dbf045c6f850e14cae

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