Malicious PDF — malware analysis report

Static analysis result for SHA-256 41358f758089ba3a…

MALICIOUS

PDF

95.5 KB Created: 2021-04-03 21:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed4aec40708173ce13cff7796da9d2b3 SHA-1: 951ffe3220dbefe1559e94c9a9614c1da7deb6bb SHA-256: 41358f758089ba3a38462243dd41098a18f63c512d0b5b871fdac12b29ba74eb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, characteristic of a link farm, designed to obscure the malicious destination. One of the primary URLs, 'https://resalured.ru/wix?keyword=models+attract+through+honesty+pdf+download+free', suggests a lure related to search results or free downloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/wix?keyword=models+attract+through+honesty+pdf+download+free
    • https://ribafiligizeki.weebly.com/uploads/1/3/1/4/131438260/6838857.pdf
    • https://vesitunerenos.weebly.com/uploads/1/3/5/3/135338192/luguxafuwawiso.pdf
    • https://zefokivovemajo.weebly.com/uploads/1/3/0/8/130874141/xolovizape-kanikadov.pdf
    • http://raisinsapp.pro/clases_de_comunicacion_humana_ejemplos9gzzk.pdf
    • http://7gusevshop.website/vilavuoytmb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/babetafaperaxov/lm358_so8_datasheet.pdf
    • https://425e2ee7-996f-4c6d-a593-b44a2a39b733.filesusr.com/ugd/bb05c1_f834ac22835f4eb69e55270ee022a473.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9d2fd827-3f7d-4e07-a97a-72934095ab24/grammar_english_full.pdf
    • https://645c32c3-7e99-4959-b93b-7980205539d7.filesusr.com/ugd/30a31c_cc231ca248f54f1d801dcc32740683ae.pdf?index=true
    • https://969948a0-d7f7-4827-958e-a3856fee42d4.filesusr.com/ugd/9d40bc_03f3e6c746b34ba396c5487bad056d69.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a7738311-356e-45f6-8d53-2dfd1c9bea1f/dodax.pdf
    • https://45f0f727-c607-4398-b3b7-8b42e23b21b2.filesusr.com/ugd/0a84ca_eb13fea3c28b4ec9ab86fe0cd6c5d867.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a3413f42-6f10-46f3-b07f-10d6123ce740/6800101236.pdf
    • https://uploads.strikinglycdn.com/files/50580d17-1a09-4d64-96bb-d6e7200d691f/what_is_a_graphic_designer_job_description.pdf
    • https://uploads.strikinglycdn.com/files/8440876e-3590-4698-9721-bd4bf77feade/how_to_make_a_face_mask_pattern_hobby_lobby.pdf
    • https://9e2bb560-353e-4f5d-a08b-1363560edab4.filesusr.com/ugd/6c032c_faf381c937794390acb3c51093557bc8.pdf?index=true
    • https://c3d762b3-5d50-4891-ab6d-43710edd2423.filesusr.com/ugd/3254bf_b1b7b9a9633a4ca58276c9b3fc94420e.pdf?index=true
    • https://s3.amazonaws.com/poresi/spanish_2_direct_object_pronouns_worksheet_answers.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000136af.bin
7d9f483189a6b12cebdd77fb8113e7f0a8d00f15f0c4a9af0c91a1b4a785a3a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136AF 5616 bytes
font_01_sfnt_off000149ea.bin
406a16b283c5d5498fe92ddaae8a0873b23802a778ed9e271b8a13764f76bef4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149EA 11316 bytes

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