Malicious PDF — malware analysis report

Static analysis result for SHA-256 b51528ebd04dee70…

MALICIOUS

PDF

81.0 KB Created: 2021-03-28 15:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1d64ae1e7ce41d1ab03d7a1644210fc3 SHA-1: 01919832f3e868f486eb30ece46ef5ff0ca62dbc SHA-256: b51528ebd04dee70fbb32b85798833a3e377278254dc6f2e73a9ae632af46388
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the nature of the heuristics point towards a malicious document designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://ponafet.ru/award?keyword=what+is+centralization+and+decentralization+pdf PDF link annotation
    • https://wanowozuvigamo.weebly.com/uploads/1/3/0/7/130738859/d2a484a2ff2efae.pdfIn PDF document text
    • http://axecheat7.xyz/kedemijateziretoi5y.pdfIn PDF document text
    • https://balixilime.weebly.com/uploads/1/3/1/3/131398392/loneput-gubedunof-bekevep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408463/normal_6041155be9a16.pdfIn PDF document text
    • https://teditiwos.weebly.com/uploads/1/3/2/6/132681477/8722191.pdfIn PDF document text
    • https://tuxewuwa.weebly.com/uploads/1/3/4/7/134776055/bipifoves.pdfIn PDF document text
    • http://thedouche.xyz/941123146918elsl.pdfIn PDF document text
    • http://mantenancie.com/easy_math_quiz_diva_questions_and_answerse1y96.pdfIn PDF document text
    • https://lajutiruwogow.weebly.com/uploads/1/3/4/5/134585316/takanodizebu.pdfIn PDF document text
    • https://bujajegufo.weebly.com/uploads/1/3/4/1/134108800/92b2fe607b0.pdfIn PDF document text
    • https://nirixebuwema.weebly.com/uploads/1/3/5/9/135990662/pirekonab-jubuguzunof-bawipuvaguraw-lefalufizab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497359/normal_5fe0c9353b33e.pdfIn PDF document text
    • http://sweetmeet.online/tabavegu4woo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385647/normal_603de4dd849e4.pdfIn PDF document text
    • http://kino-vezde.ru/multiplying_decimals_video_with_modelsumadj.pdfIn PDF document text
    • https://nopuwilimo.weebly.com/uploads/1/3/4/4/134490360/479513.pdfIn PDF document text
    • https://gobunelesivuwol.weebly.com/uploads/1/3/2/3/132303092/sigidane_lovaro_padamipufotog_durujoxepizel.pdfIn PDF document text
    • https://vemetufubejukat.weebly.com/uploads/1/3/4/3/134367776/purapuzupux.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/d044a3a9-1ca8-444e-8dd6-23c4b568e46f/how_to_be_a_good_leader_and_team_player.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c274c22-8eb2-4309-b2fa-3de9f3b63a75/darebijegidi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17bd61dc-a950-45a8-848e-c788c0f866d1/how_to_connect_my_motorola_bluetooth_headset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e878fb96-15b1-4f29-95da-eeedb989cf8b/69353649524.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/will_ahsoka_be_in_the_mandalorian_season_2.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/is_advocare_24_day_challenge_worth_it.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/stop_form_submit_using_javascript.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/banjo_movie_video_songs.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_off0000f1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FE 5096 bytes
SHA-256: 444783a71ec199b9e6d7f4e407ca3a63a7eef614a062746cc7133e8116a2ed87
font_01_sfnt_off0001034a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034A 10756 bytes
SHA-256: c79a4d7f32ab9883dcc3ffe4be4fd9acc7c729a8a569ee427450a999a2b3f3c0
font_02_sfnt_off000127fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FB 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f