Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d30d821efc71c4f…

MALICIOUS

PDF

78.7 KB Created: 2021-03-19 07:18:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 765da753c6770bda5700ff9e4b82e15e SHA-1: c9f6d40c94a32d9f2384b1e9d45a9ea7b80713d8 SHA-256: 2d30d821efc71c4fa3d87dde0efa463dd571b5d130af38796cb35f9f55aaa90e
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, and one primary malicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though partially corrupted, appears to be a search query, suggesting a phishing or redirection lure to the malicious domain.

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://baarspo.ru/strik?utm_term=does+safety+1st+car+seat+fit+in+graco+stroller PDF link annotation
    • http://giwewigipebi.medianewsonline.com/ragemivopejoxix.pdfIn PDF document text
    • http://paxezimusosesa.scienceontheweb.net/xiwesoki.pdfIn PDF document text
    • http://nuvagefo.medianewsonline.com/3d_printing_concrete.pdfIn PDF document text
    • http://manuximaxemeje.scienceontheweb.net/persuasive_essay_topics_for_middle_school.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/424bcd7a-f81f-4f08-9d4d-de0364d3062c/famous_honolulu_typing_school_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/logo_quiz_ultimate_answers_level_23.pdfIn PDF document text
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_4f9d560967f94e92afd053a1e7c6f648.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a84da7a6-419d-4ee4-8142-5ee556887350/rules_of_the_game_theme_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/attestation_d_employeur_pole_emploi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dbfa1c2-3a2d-4efb-936b-375bca4c7b6f/tikuvazulijaxot.pdfIn PDF document text
    • https://3e1d1bad-f645-4ebd-ac75-469e7ff7c972.filesusr.com/ugd/e745be_f39a046ff30b4406a2cc983d3cd944d0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/03986ad5-1d36-4212-85fe-f6c099fce9bd/71171025354.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bf4de37-bd29-476c-9453-6d1290dea83e/what_is_a_flowchart_in_project_management.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ddeece4-bd58-4bec-be8d-78feb51c0c56/10970514869.pdfIn PDF document text
    • https://6dca1d0c-b102-4aa4-a312-d013f97c39dd.filesusr.com/ugd/fb87fb_744cbb0c8edb4d46b5a6f3ede02825e7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc7a12b4-e0fd-4b6f-a095-29cc66af793b/radio_shack_mpa-250b_owners_manual.pdfIn PDF document text
    • https://05491ccc-77c7-428b-9c25-74f2c6c50d4a.filesusr.com/ugd/d51d36_1674ab1010b045d89ae72e7c7e44e948.pdf?index=trueIn PDF document text
    • https://83f018a0-8e49-44f0-b57e-805e464a5f06.filesusr.com/ugd/10a4aa_59950c586aa84280b4001b613d1b1acd.pdf?index=trueIn PDF document text
    • https://9610c43f-1b2a-4a8a-b660-75aaf3908198.filesusr.com/ugd/286fb8_a0e25575997c46a4a6f55a29070a6c9a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb1177c7-82d1-420a-a6e4-85cc61266817/32763109408.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7949af42-9426-40d3-b9af-cd3ae611a0b1/korean_quotes_with_english_translation_tumblr.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_off0000f7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A2 5200 bytes
SHA-256: 4b30106c44432a051a2358f88e4d2a7ba44e1891c013e50b0b52de6d16fde662
font_01_sfnt_off00010981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10981 10580 bytes
SHA-256: 8d604100a97071f1bcc3a13f06b5e6dba1ff9351d5ecbc21c0f933d3dbd2b093