Malicious PDF — malware analysis report

Static analysis result for SHA-256 1abc9cab12714a48…

MALICIOUS

PDF

118.2 KB Created: 2021-03-14 12:15:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 4ec6671a7a20b0b3678752d90b26ca1e SHA-1: ec8af806f02ec04d42809128bac7d267277894fa SHA-256: 1abc9cab12714a48033955da0cefa850206a3c9328dea30f255e7125b1ec3140
186 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one URL pointing to a suspicious domain that is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a large number of outbound links, many on disposable hosting, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

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://soxebez.ru/123?utm_term=endorsement+form+for+driving+licence PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486350/normal_60120ec3d4968.pdfIn PDF document text
    • https://cdn.sqhk.co/bofogarabu/OjcLnDY/mame_shooting_games.pdfIn PDF document text
    • https://wunawewob.weebly.com/uploads/1/3/0/7/130775592/7b52e3a160e.pdfIn PDF document text
    • https://cdn.sqhk.co/wixadigizal/Lhhkfid/dailymotion_apk_no_ads.pdfIn PDF document text
    • http://premial.su/59317092385kgy7l.pdfIn PDF document text
    • https://zesakexe.weebly.com/uploads/1/3/5/3/135314388/nebubogomefif.pdfIn PDF document text
    • http://healthytrands.com/nakamodebazosekilqgtau.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475997/normal_5fe19f100706b.pdfIn PDF document text
    • https://pewofofuvalok.weebly.com/uploads/1/3/0/7/130775386/ruzijeturitona.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/icHFEgh/70085811353.pdfIn PDF document text
    • https://cdn.sqhk.co/nadetajagupe/SQUjdev/zenozulomu.pdfIn PDF document text
    • http://italiahot.space/sutumepofefudumufamepadita9z7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463792/normal_5feefeedbe065.pdfIn PDF document text
    • https://sodefabufu.weebly.com/uploads/1/3/4/4/134473286/fuzuton-timedaputu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/92365ee8-391b-473f-bc58-258f66e64a4f/airport_express_base_station_a1084.pdfIn PDF document text
    • https://2061f665-9309-41a6-981d-137229ee7e60.filesusr.com/ugd/eb2fe6_acb114098c4545fea5c1bbd874ede336.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ed95a4c-5a35-455a-8efa-6086661c8b19/peer_gynt_in_the_hall_of_the_mountain_king_orchestra.pdfIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_cfcb9101682a498a8ad5bec2798c5a25.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/089615d1-ea31-45fc-901c-bc220f09113e/36427059689.pdfIn PDF document text
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_03ae9edb3d2f4be5885895fe4664d0b0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbe05f76-03d8-4fbb-9bcb-56833d6cbb69/19990491142.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98741256-0aa5-4961-ba26-be8bedeec3ad/how_to_pair_sennheiser_rs_175_headphones.pdfIn PDF document text
    • https://48b7024d-7414-4593-b44d-ed892b96ad15.filesusr.com/ugd/3e5db3_06d3da86eebb4b4ea72901eb9a67c288.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_off00017081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17081 9224 bytes
SHA-256: 9668b2ec8e9fed79e9370d236c179c639f5888cf847723323dcfc0eadcaaa97c
font_01_sfnt_off00018ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EBD 5148 bytes
SHA-256: 73c678572eaf70967eaaddf96200fa200ede0b528ac95ad62793503a3cd2eebc
font_02_sfnt_off0001a03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A03B 13044 bytes
SHA-256: 54ef645d83721c84bbb1bedc3cdeef8b7eb5256f061386c0a5460207118c3089

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