Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7cf4347f91230d8…

MALICIOUS

PDF

80.7 KB Created: 2021-03-10 04:51:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 4800f3a5cd7f9b9ce6ca50b92ce336ff SHA-1: a732118e1926b37ea7bc908c9c2b3a39758c0db7 SHA-256: e7cf4347f91230d8f7ecfc9d9f7c0396167f0cfa3026af4af1aff285a0bd81db
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution T1553.005 Security Software Installation

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, some pointing to disposable domains, and a heuristic firing indicates it instructs the user to disable security software. While no scripts were explicitly extracted, the presence of embedded URLs and the security bypass instruction strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://golowaki.ru/123?utm_term=super+bomberman+r+para+pc PDF link annotation
    • http://support-copyrighthelpservice-about.com/michael_fiore_text_your_ex_back_reviewsmxs85.pdfIn PDF document text
    • http://gayerkan.com/do_kitchenaid_mixers_go_on_sale_on_black_fridaydpayg.pdfIn PDF document text
    • http://pogadai.xyz/abaqus_for_catia_v5r20_free-6uq8n.pdfIn PDF document text
    • http://italywom.space/375120259469iqmg.pdfIn PDF document text
    • http://particuliers-societegenerale.xyz/how_to_access_html_code_in_wixzihbt.pdfIn PDF document text
    • http://blancop.xyz/69978392596rd6sd.pdfIn PDF document text
    • http://tradestaroffice.com/calendar_june_2018_printablew8tyx.pdfIn PDF document text
    • http://pazadixokumox.sportsontheweb.net/76784725844.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://watusatuvor.myartsonline.com/wosafeb.pdfIn PDF document text
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_f34e96a715434fc392f2bb0b8fb89b17.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4446c6d7-210c-4855-861b-739fb1527e4f/amas_2020_winners_bts.pdfIn PDF document text
    • https://469ee322-798e-4c1d-9571-af6764901f97.filesusr.com/ugd/57169b_bffbff5978a34ebaa0f4d70ab1312b52.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b895596-0ebb-4f13-ac11-64b6c50d9023/how_to_put_grip_on_a_wood_baseball_bat.pdfIn PDF document text
    • https://54a0e2cb-796f-4f80-9aaf-d11633176b06.filesusr.com/ugd/b0c554_3e85da1ac6eb4eb39ca2ebaf62dadbf5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/four_veronica_roth_ebook_free.pdfIn PDF document text
    • https://f4a80ce2-0a24-44e2-aff7-13c87a434ee9.filesusr.com/ugd/ace063_9b3bd0392aeb43debf0391fc31e49736.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/88528077691.pdfIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/sabusenuxowodurokisem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32a58f7b-f647-4492-a95b-fed93bb64444/80304443315.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2395dc9-5860-4ac0-999b-91130fc6adf4/the_nutcracker_the_untold_story_full_movie_online_free.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_off0000ee67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE67 3612 bytes
SHA-256: 741342c9cdcce51d2ba354cfbd90cee6863b89ee5d65d4939c8b5aa5eb24667b
font_01_sfnt_off0000fb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB59 5112 bytes
SHA-256: a0006a5283e06d051b417ea45c3cd69719680a0aa131e170b6b8bb643333c39e
font_02_sfnt_off00010ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA2 12532 bytes
SHA-256: d7fb197df26b999124daac4a171a5391b2ba8b5477d5199962eba69c352ced1b