Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc35458291226ba8…

MALICIOUS

PDF

68.1 KB Created: 2021-03-11 15:08:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7a8bf67d97e1f94b46f66f7ec6152663 SHA-1: 297b51ac9d73dbbbd12140e1b7ea2b1ead974cfe SHA-256: dc35458291226ba88e5fd198f4990a38c91cf1aba51ca36e3453d8f7ebc1cd2a
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/aws?utm_term=how+much+is+a+new+honda+rebel+250 PDF link annotation
    • http://musofiron.ru/aprender_lettering_onlineii4fs.pdfIn PDF document text
    • http://clipshd.design/what_is_the_purpose_of_a_quit_claim_deedgarlq.pdfIn PDF document text
    • http://verification-help.com/chemsheets_calorimetry_3_answersv9vf7.pdfIn PDF document text
    • http://kudukudimox.sportsontheweb.net/slaves_to_darkness_start_collecting_instructions.pdfIn PDF document text
    • http://vostokzapad.su/69874553695zc9cl.pdfIn PDF document text
    • http://uscreditcheck.info/zoruxejokomidugetex1hvje.pdfIn PDF document text
    • http://rejawulomov.mywebcommunity.org/dragon_age_origins_rogue_archer_skills.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c480cc3d-c044-45b7-a7fa-747782367dcd.filesusr.com/ugd/a26f59_464617441fd540e19ecc9657a90d7abd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b59ceb2e-1be0-4666-8074-7b3f3a7794f7/make_your_own_kitchen_nook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b42d54f8-a34a-48e5-9f86-4c9cff18ac70/where_to_invest_money_2021_philippines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acbdd64c-5d7a-423e-a394-37973c81e910/zerogunenalalekoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92271e9a-e1d7-42b1-8ae9-a6be9086673f/fawelonovodikuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e163c9bb-0fdf-4864-b2e7-8294d3216fe8/texutufomusejuru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18961774-eb4d-4302-a4d2-51df7df4ca61/7373185462.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b140e19-a054-4eef-aaa5-9d7936cf4922/msi_a78m-e35_v2_ms-7721.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c32cee6c-80d4-4f49-882d-fb6f4698b49b/our_troth_vol_2.pdfIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_301b4be5bfa544f6b422dabc90c6cb38.pdf?index=trueIn PDF document text
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_ff54a723e6ae4dc49560f4e555da6df3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0cfa41f-cbeb-4f87-81af-98b4ffcbbfcd/britax_advocate_car_seat_manual.pdfIn PDF document text
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_bb33d3fd002b48e7b549715dd3a68158.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4db8db60-e43a-4f53-955a-3520a02a3dca/65246111004.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB5 5768 bytes
SHA-256: 71f7adf5bf72e6c95a1fcb66514821efcc213f356e5689c117180e1d73150ef6
font_01_sfnt_off0000e03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03F 10148 bytes
SHA-256: 834baf13e96b899974c1d8fdd86dd6026e312e8758eabd393f44ace2be5ee572