Malicious PDF — malware analysis report

Static analysis result for SHA-256 d52073fd0e8e11af…

MALICIOUS

PDF

90.2 KB Created: 2021-05-14 12:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: a2df937bb304830f15f156b49301cae3 SHA-1: d7b11b965ac2e0cebbab108741bdaf5bad325eae SHA-256: d52073fd0e8e11af70428181f379158a563114538bceac43679c61913501eced
166 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs and is flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://vilenefex.ru/strik?utm_term=is+super+kirby+clash+free PDF link annotation
    • https://cdn.sqhk.co/verexoleki/aVih5s4/formula_1_racer_game.pdfIn PDF document text
    • https://cdn.sqhk.co/puwidebudojo/ZJ55jiw/44820789359.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495043/normal_5fd8767a8112e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450156/normal_606e20737180c.pdfIn PDF document text
    • http://noxaduva.mypressonline.com/zowiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383302/normal_606796ae8861c.pdfIn PDF document text
    • https://cdn.sqhk.co/xubewarow/ggpjaKb/juegos_retro_para_pc_sin_emulador.pdfIn PDF document text
    • https://cdn.sqhk.co/norejasiwiza/suXtGhb/6178975713.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467576/normal_60673e5ee5124.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415065/normal_6013bf06cf678.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365586/normal_5ff0c8fce2e0c.pdfIn PDF document text
    • https://cdn.sqhk.co/zukasedu/gizJZjh/birosogosivipotumopanunu.pdfIn PDF document text
    • http://rexonina.medianewsonline.com/6_of_crows_characters.pdfIn PDF document text
    • http://tapavinologo.mygamesonline.org/algebra_2_textbook_glencoe_mcgraw_hill.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451760/normal_5ff0151660591.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500429/normal_60322a8fec0b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446380/normal_60314a960da42.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://aa6eca1a-c690-4a36-985e-a873157a80b3.filesusr.com/ugd/081493_5701ce1f1b174b94972b2adc468195c8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd122313-bcd0-4420-8893-4be8fb4e0690/how_to_make_a_simple_cake_at_home.pdfIn PDF document text
    • https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_ab5711fd65d5433e9fd78fe7c8874195.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c8e4d7f-3832-437b-921f-93ec785e54d6/how_do_i_reset_my_canon_e470_ink_cartridge.pdfIn PDF document text
    • https://198d5876-2e36-4a54-a59d-b4c1060b65be.filesusr.com/ugd/4733ca_b6637f8147e14b54ad99ef9b73a043dd.pdf?index=trueIn PDF document text
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_9a3714151ae8496da42470b0acfd172a.pdf?index=trueIn PDF document text
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_546ec21621b447afa9dac409af5c024b.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_off000107df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DF 7368 bytes
SHA-256: fa91bed9de29b26cdb5e3417abc097ce64181eb30009a88808c16e83930316cc
font_01_sfnt_off000120b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B3 5344 bytes
SHA-256: 6dfffa98b767654a2ec06f58a4b51f59eac82a7e9d505e7a76de0e53ee45055e
font_02_sfnt_off000132e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E7 11632 bytes
SHA-256: bffbbbb782a1966e253bf1b0f532af907eda659febf60848094d8098ae1c1e2f