Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b97070f6f9f75c…

MALICIOUS

PDF

77.6 KB Created: 2021-03-31 13:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8fdff4c8dc09157149a65d9867f7609 SHA-1: 2dca7482af8071e46383dce63846ad7620f2d585 SHA-256: 56b97070f6f9f75c4ac3302a95bc8cf240f5b506fa45ceebc4146ba4152b498a
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to PDF documents hosted on various platforms, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point to an attempt to drive traffic to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=al+quran+30+juz+download+free
    • https://berarenojinoz.weebly.com/uploads/1/3/4/7/134737003/bagowumid.pdf
    • https://funopazotasar.weebly.com/uploads/1/3/1/0/131070342/9060574.pdf
    • http://sujimelowakolop.medianewsonline.com/40_rules_of_subject_verb_agreement.pdf
    • https://vizedaxitexoter.weebly.com/uploads/1/3/4/7/134740617/7496834.pdf
    • http://norasuzajo.mywebcommunity.org/runabizawobuwobovalur.pdf
    • https://kurupatasewa.weebly.com/uploads/1/3/5/9/135958836/wefemiwosude.pdf
    • http://xivazokib.medianewsonline.com/483206391.pdf
    • https://pubedazemel.weebly.com/uploads/1/3/4/8/134870130/kulefupebodevigamoli.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/98403621-a70a-4a2d-8849-8f8a32c08fb7/tukifawimirof.pdf
    • http://wegugoleta.onlinewebshop.net/11802323138.pdf
    • https://uploads.strikinglycdn.com/files/06bbbde2-c1b9-4b86-b5ea-2bbb2e702834/13985438995.pdf
    • http://gedawov.epizy.com/solve_logarithmic_equations.pdf
    • https://uploads.strikinglycdn.com/files/c0587dbe-59bc-49b9-8f86-ae65f10a9fa1/marvel_films_in_order_of_story_2019.pdf
    • http://janalusexisowa.epizy.com/nolawufomavazedivaw.pdf
    • https://uploads.strikinglycdn.com/files/e05217e3-1534-41c8-a3b2-1b45240b8bd2/94510385788.pdf
    • http://fezekugagow.rf.gd/calendar_ortodox_ianuarie_2020.pdf
    • https://uploads.strikinglycdn.com/files/8f85219a-2890-4fda-935b-2709d351e3bd/casio_wk_500.pdf
    • https://uploads.strikinglycdn.com/files/d1cad999-beb6-4c94-a8ae-cd8fe4b00c01/la_crosse_digital_wall_clock_instructions.pdf
    • http://gogujigasad.onlinewebshop.net/84379780253.pdf
    • https://uploads.strikinglycdn.com/files/4c5d3de3-78c4-483c-97c3-c8af82e620f4/ipad_mini_5_case_with_pencil_holder_singapore.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3d3.bin
02ff14d6bfdd3095c2bba6fea3720341c51b169e32732f9166ca706d3434451f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D3 5116 bytes
font_01_sfnt_off0000f55c.bin
c4bc12a698b290a65279972bfbd7634119d387d28c22911756ba25cd87e418cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF55C 10676 bytes
font_02_sfnt_off000119b5.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119B5 4324 bytes

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