Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c4219dbcb8035f…

MALICIOUS

PDF

77.1 KB Created: 2021-06-05 18:37:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9dc4cfaa83b5bb97a8bc8e405ccfb772 SHA-1: 13187ab67edd30a06b7bc71a7b8f3787bfb692ce SHA-256: a6c4219dbcb8035fc2b21c8790c7eccb367fc3ae476fb199dc039b47961c9a46
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a significant number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. Although no scripts were explicitly extracted, the PDF structure and heuristic firings are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://oniceh.ru/pbw?utm_term=how+many+grams+is+32+oz+of+cream+cheese PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4427795/normal_60b59e7b9b218.pdfIn PDF document text
    • https://xafafiseroferop.weebly.com/uploads/1/3/4/5/134525648/fivajofudufesad_jalotomagi_desidixit_votufepikur.pdfIn PDF document text
    • https://vugadeji.weebly.com/uploads/1/3/1/4/131406436/deniwibudutalezefif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401989/normal_60625afd5e081.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411246/normal_606e45395dc1f.pdfIn PDF document text
    • https://wazexusevawixi.weebly.com/uploads/1/3/0/7/130776334/6120400.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505839/normal_5ffe7bd409a25.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
    • http://ziduzobif.pbworks.com/f/pros_of_genetically_modified_food.pdfIn PDF document text
    • http://duziruromeja.pbworks.com/w/file/fetch/144488688/lord_shiva_telugu_mp3_ringtones_free_download.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/w/file/fetch/144566655/how_to_set_temperature_of_dawlance_refrigerator.pdfIn PDF document text
    • http://supatibu.pbworks.com/w/file/fetch/144417015/1962533707.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dd9741a-049d-4916-9fa9-e185450f6eb2/fluval_306_external_filter_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42dc2392-0a81-40bc-946f-9dd238e7cae5/wusago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad8a62a6-0369-454e-852d-85f49de2e46c/insecure_in_love.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45f80534-39ca-4f1a-8835-211136d05e31/cisco_8742hdc_remote_sensor_location.pdfIn PDF document text
    • http://pagorevet.pbworks.com/w/file/fetch/144448290/89836304670.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea242f28-1e83-4c97-ad4e-7a56e5daf627/how_to_clean_hp_7510_printhead.pdfIn PDF document text
    • http://kepigiwup.pbworks.com/f/cannot_open_msg_file_with_outlook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5810168f-2e89-43fd-8fc3-bf172f233f66/zuratazivi.pdfIn PDF document text
    • http://kokoxudalux.pbworks.com/w/file/fetch/144587814/37497852564.pdfIn PDF document text
    • http://sokulus.pbworks.com/w/file/fetch/144464850/11280199433.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD810 5472 bytes
SHA-256: 012c8ac689e914c07772c381c2b5268ee7e6f2ba51dcf27eb9a8c89c68d74cbe
font_01_sfnt_off0000ea84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA84 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0000f311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF311 11276 bytes
SHA-256: 2156fdbcf824aa807886a6867bf6dccb40a124a7b8386c602490f86f3e37cdd7
font_03_sfnt_off00011841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11841 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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