Malicious PDF — malware analysis report

Static analysis result for SHA-256 9788661b82a2a256…

MALICIOUS

PDF

78.8 KB Created: 2021-03-17 23:46:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 417644f8662722410a42245f39bc2739 SHA-1: 2506bbabd295492c76a6241929e31b7a618fe6eb SHA-256: 9788661b82a2a25633f7047a5775f0529f74751941069d3ce5c4473c9d562c40
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggesting a malicious intent to redirect users. One of the embedded URLs, 'https://fokemale.ru/123?utm_term=wallpaper+photo+hd++car', appears to be part of this scheme. The ClamAV detection and ML classifier strongly indicate malicious content, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://fokemale.ru/123?utm_term=wallpaper+photo+hd++car PDF link annotation
    • http://xemizawufogutuf.scienceontheweb.net/mixirinepirefagojuwa.pdfIn PDF document text
    • http://wowogobofomufu.mygamesonline.org/makkar_ielts_speaking_2020_download.pdfIn PDF document text
    • http://kodutizaga.mywebcommunity.org/flushing_meadows_park_map.pdfIn PDF document text
    • http://gagivukamuw.getenjoyment.net/lolip.pdfIn PDF document text
    • http://nuwojukow.mygamesonline.org/advances_in_soil_microbiology.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://s3.amazonaws.com/xufaxoferugod/29261453283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f171537b-20ae-4688-b232-552babf285fe/which_language_is_better_python_or_c.pdfIn PDF document text
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_abf43c23dc4f440e9cf1fa4a34380ba0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/davawina/amrinder_singh_all_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65f4da51-606c-4390-b9cb-61b6fa1ba646/sandisk_clip_jam_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/alternative_zu_android_file_transfer_fr_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/23878982526.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c1a7954-8917-4092-9d02-9936df00d493/dorubotevazagofojapuf.pdfIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_cc7b805cdc2349798181bcb341a6b420.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/dictionary_with_antonyms_and_synonyms.pdfIn PDF document text
    • https://s3.amazonaws.com/zafibimutadoti/template_for_travel_expenses_form.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/39438958973.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/erik_satie_gymnopedie_sheet_music_piano.pdfIn PDF document text
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_3e0bfc2465424738b36cc81dd9d5e095.pdf?index=trueIn PDF document text
    • https://a40b6db0-1679-4e03-879f-ac5827b9aa7d.filesusr.com/ugd/dba42a_1c3975a8cfdd408d9fda52abc64cbce3.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_off0000ec43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC43 4628 bytes
SHA-256: 178df985cf98b1bb4a53bbbe0ee91320404bd82c903778172588f61d5632325d
font_01_sfnt_off0000fc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1C 10512 bytes
SHA-256: fd2000d995ba873424059c67e40a3b0967639730b652710d79fddd6bc67c784e
font_02_sfnt_off00011fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCB 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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