Malicious PDF — malware analysis report

Static analysis result for SHA-256 3422111bdb5e55ad…

MALICIOUS

PDF

79.2 KB Created: 2021-06-10 22:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5714e8f886862e536619eb375037c98c SHA-1: 5f6be369cdd5a40a6a3c66775fee4dc31771c4de SHA-256: 3422111bdb5e55ad5ae8b062435851f4e657a11fde26004f7d99b5815aa4f237
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary external URI pointing to 'https://smidgel.ru/pbw?utm_term=mod+apk+dragon+ball+dokkan+battle'. Heuristics indicate this PDF is a link farm on disposable hosting, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged it as malicious. The document body, though heavily corrupted, contains fragments suggesting a lure related to game modifications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://smidgel.ru/pbw?utm_term=mod+apk+dragon+ball+dokkan+battle PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463308/normal_605d37f415a92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501028/normal_60610e27cc6e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418791/normal_60b9aec311765.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460966/normal_5fdaab57985fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422631/normal_5fdeac2189db3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485929/normal_5ff2c02ad79f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489241/normal_5ff4983704bc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409806/normal_6033073a7c319.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458849/normal_604876bbaef52.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/fce9c393-c907-47cb-ad23-8caf272bef01/is_it_ok_to_use_infrared_thermometer_on_humans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17d790c8-7c61-4f7a-9de4-0cf0fb58c962/skyrim_best_mod_list.pdfIn PDF document text
    • http://garewewaziwu.pbworks.com/f/49343907141.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d94c220-0dad-4211-becc-85de5aaa1b54/how_to_hack_hopeless_land_diamond.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6da912d3-2253-48f8-92e7-77e3fbb94316/79500765680.pdfIn PDF document text
    • http://redejok.pbworks.com/w/file/fetch/144497856/kozawitatenowuziboru.pdfIn PDF document text
    • http://pusavivo.pbworks.com/w/file/fetch/144556179/84416257607.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c57f473b-6c81-46d7-9275-0dd772dc5996/o_hobbit_uma_jornada_inesperada_assistir_online_legendado.pdfIn PDF document text
    • http://sisiwovad.pbworks.com/w/file/fetch/144788280/applied_mathematics_mcq_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ce01453-316e-4c7f-810b-ded916574b77/salvation_langston_hughes_purpose.pdfIn PDF document text
    • http://sekodegaxex.pbworks.com/w/file/fetch/144701151/zoweduxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9f04562-8cb8-4c6c-85e7-52a6775099a7/84123344304.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b3750ac-a73a-46e3-b7b0-cd890f620ec7/omron_bp742_hem-7200-z.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eafbe0f-c24c-4a4c-b49a-c08765d33340/30211161989.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_off0000df9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9F 4896 bytes
SHA-256: b16029421075ea447390401965125fb1f199ad9141c9d78f9fdf4b6b0a942320
font_01_sfnt_off0000f05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05B 21888 bytes
SHA-256: f905efa64d92f0ff26325e953c0a74a5e44af0aed4281e4fdbe0c1aee8f2c7d7
font_02_sfnt_off00011f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F80 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176