Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd6f0a89b8a5908…

MALICIOUS

PDF

83.6 KB Created: 2021-03-28 08:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bee732a7c66655947c92fbbbdea8fb57 SHA-1: 2dc5827f4d6b4ceb5d75608c25b4a3d47e709618 SHA-256: bcd6f0a89b8a59087f07ea78f14b310da6dcd20033d2ddea1d740adfb374fe77
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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
  • 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://lozipotod.ru/123?utm_term=apprendre+le+japonais+assimil+pdf
    • https://bomazadoxu.weebly.com/uploads/1/3/4/4/134474586/3f81492f342cb.pdf
    • https://lubavezutumeji.weebly.com/uploads/1/3/4/7/134757539/8b3292ab.pdf
    • https://cdn.sqhk.co/tezofugowura/xhgKghh/blaze_monster_truck_characters.pdf
    • https://raputaluwim.weebly.com/uploads/1/3/1/6/131606275/8443740.pdf
    • https://cdn.sqhk.co/texivewa/gZijpge/larawigobilan.pdf
    • https://babibuxa.weebly.com/uploads/1/3/5/3/135302477/9034336.pdf
    • http://riragukigud.scienceontheweb.net/98370323651.pdf
    • http://dizititakozazi.mywebcommunity.org/fabosedonujenowu.pdf
    • https://zorivaleguzovul.weebly.com/uploads/1/3/4/5/134596353/2c878751fd576f6.pdf
    • http://rebibedo.mywebcommunity.org/18661688697.pdf
    • https://cdn.sqhk.co/bojojiweg/jiUpIgf/bupemivexadike.pdf
    • http://bidimiw.sportsontheweb.net/96665465844.pdf
    • https://roralolew.weebly.com/uploads/1/3/0/7/130775143/8168555.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e2b91792-6003-4f1e-a798-a8a1d6baae0c/44020978457.pdf
    • https://s3.amazonaws.com/vuzotisenixava/core_java_interview_question_answer.pdf
    • https://s3.amazonaws.com/mujevubutukoxu/what_is_the_purpose_of_a_prayer_labyrinth.pdf
    • https://uploads.strikinglycdn.com/files/4e9b6e8a-745b-41cd-868f-43ff84120b95/hp_officejet_8620_printer_error.pdf
    • https://uploads.strikinglycdn.com/files/baa24b47-bd4c-460b-8f85-7d7a9a844f29/kubota_bx25_owners_manual.pdf
    • https://s3.amazonaws.com/vuforewebub/43769436620.pdf
    • https://uploads.strikinglycdn.com/files/f5c23ff3-6351-42d9-9359-121a65ed9adf/wooden_chair_sketchup_warehouse.pdf
    • http://bowegasobufur.myartsonline.com/91731324474.pdf
    • https://uploads.strikinglycdn.com/files/5b507651-957d-4c7f-a76c-1c2647e83917/suruvofolererogekifoja.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e61e.bin
5d07847114bcbb57ee0699631025291d6cad6e84cb0e3f6969c8f0a24dcb4938		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE61E 2956 bytes
font_01_sfnt_off0000f0b7.bin
bd10883ae53048ea80ad915ae07086ec2074ab706e3e2c550583fbb68e996082		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B7 5252 bytes
font_02_sfnt_off00010282.bin
4bbe0721adf790bae539d769f84e8cded9b0ba31a9f9636da4d9ce792563442c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10282 12348 bytes
font_03_sfnt_off0001298d.bin
e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1298D 16092 bytes

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