Malicious PDF — malware analysis report

Static analysis result for SHA-256 139de38510226c9f…

MALICIOUS

PDF

70.8 KB Created: 2021-03-23 15:42:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea03291c9cf764d1ee8899b777f82d92 SHA-1: 2bf3cdcd0f805a2d61ac9859d1cea4af6c8ed7a3 SHA-256: 139de38510226c9f5a8a3b6abf27bc96a55e376bfcd8d95fda2ef0b4af6ae252
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on S3 buckets and appear to be part of a link farm designed to attract search engine traffic. One of the extracted URLs, 'https://nipisod.ru/123?utm_term=bigasoft+video+er+pro+firefox+extension', suggests a lure related to software extensions. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nipisod.ru/123?utm_term=bigasoft+video+er+pro+firefox+extension
    • https://mumerigowijegap.weebly.com/uploads/1/3/4/7/134771458/mujebunobazuti.pdf
    • https://cdn.sqhk.co/tororukiwuri/egggfhO/kilekalalexazerugutew.pdf
    • https://cdn.sqhk.co/bekutojeke/itcifgj/48310302846.pdf
    • https://zesudegefomoga.weebly.com/uploads/1/3/1/0/131070027/jatebe-limusasatax-fasipezupasiteb-vibovezet.pdf
    • https://gojudewusidaza.weebly.com/uploads/1/3/4/8/134888042/8420c612508f.pdf
    • https://wolunogejafijut.weebly.com/uploads/1/3/4/6/134649672/5205396.pdf
    • https://bilezebije.weebly.com/uploads/1/3/4/3/134344171/4634434.pdf
    • https://fosevagepuvuro.weebly.com/uploads/1/3/1/8/131858592/cd27263f09d821a.pdf
    • https://cdn.sqhk.co/mivesumor/jXgehh6/4122783602.pdf
    • https://jukirabupunux.weebly.com/uploads/1/3/0/8/130874410/pafuwi.pdf
    • https://cdn.sqhk.co/muribirigim/ijUpsxr/love_apple_farm_menu.pdf
    • https://cdn.sqhk.co/wovegase/rhchibg/cute_hairstyles_for_short_hair_for_school.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dazawojob/camscanner_license_1._7_apk_full.pdf
    • https://s3.amazonaws.com/xelimewat/gopoxuxokodesapaxugur.pdf
    • https://s3.amazonaws.com/dojivewobasuval/where_can_i_buy_cheap_ribbon.pdf
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_9f68aadac2594d33844883c3abd082a8.pdf?index=true
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_63b9268d0f4245b796df820cda049746.pdf?index=true
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_7bb5cc1e046545109484de67c1784cb5.pdf?index=true
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_58422c75cceb45e6a4567c1558f25f03.pdf?index=true
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_39911fb82c704c27a155ebfd67cd4305.pdf?index=true
    • https://s3.amazonaws.com/paxunu/53640029391.pdf
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_533be56da5e349b297d15eb42a8c6308.pdf?index=true
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_3dc0412660c44a51907cf1a3fa2ea4db.pdf?index=true
    • 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_off0000d5d2.bin
df915b5b693cad24d6090f764e2a52894e100addb5411f719a65ef5548d0293b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D2 5352 bytes
font_01_sfnt_off0000e82e.bin
073b1cffed7d54619633fde68b4f8fc44fb4be7dc7969a6af9e3e0a6cb155ffe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE82E 10836 bytes

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