Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f88262c3b676d7c…

MALICIOUS

PDF

72.1 KB Created: 2021-03-15 03:02:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1602267a46dd14e7a2bd51f4ef083c1 SHA-1: 18d011cdf1a5225d3df38e3137eb0344a9221415 SHA-256: 9f88262c3b676d7ca8cd1297cc8953a7af9445ba5a97fc1fd3da0ca1a86ab6f4
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with one prominent URL pointing to a suspicious domain. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=cours+de+fran%25C3%25A7ais+niveau+d%25C3%25A9butant+pdf
    • https://cdn-cms.f-static.net/uploads/4477147/normal_5fdbe30957dab.pdf
    • https://cdn-cms.f-static.net/uploads/4406809/normal_601675704297b.pdf
    • http://boforotaje.mywebcommunity.org/samsung_galaxy_tab_t580_hard_reset.pdf
    • http://ruxuzosok.mywebcommunity.org/97862822834.pdf
    • https://static.s123-cdn-static.com/uploads/4403283/normal_5fcf29795d259.pdf
    • https://cdn-cms.f-static.net/uploads/4470400/normal_60464fc78bf5d.pdf
    • https://cdn-cms.f-static.net/uploads/4403415/normal_604b8f09f37b5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e09c30c0-144a-4de8-bee1-5b41f31bf9f4/how_to_make_your_textured_walls_smooth.pdf
    • https://b19b3b79-9ae2-4e99-9b16-ef32671d60f4.filesusr.com/ugd/0bc867_bc74d796be2245f498d6d5d6c430da31.pdf?index=true
    • https://521a9f5b-5c7e-4f25-a9e4-5446fb1b1975.filesusr.com/ugd/c1a494_978675e86471499f8d7667e1e1064e4a.pdf?index=true
    • https://s3.amazonaws.com/pazovugal/mevofarasadawujurogofezin.pdf
    • https://s3.amazonaws.com/rojalexipokadaz/armed_heist_apk_and_obb.pdf
    • https://s3.amazonaws.com/fuwenoxuzasila/zixalewijibigezib.pdf
    • https://s3.amazonaws.com/geraromu/adobe_indesign_flyer_template_free.pdf
    • https://uploads.strikinglycdn.com/files/392f45f5-732a-4981-a426-ff7034689aec/2168873630.pdf
    • https://s3.amazonaws.com/zukogi/57590577327.pdf
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_e4e35d7b0b3b4e6caa33e135fcd07a5e.pdf?index=true
    • https://s3.amazonaws.com/jifedefujodu/casio_calculator_mac.pdf
    • https://s3.amazonaws.com/zazelujeju/kidezujodan.pdf
    • https://uploads.strikinglycdn.com/files/ba19268f-3bde-46fe-9e82-96dcba49b82c/how_to_find_maclaurin_series_expansion.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_off0000d6d2.bin
d3bd9954adf10688c93137ee9ddfc295a3d9079c026a0e877178e442621bc691		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D2 5432 bytes
font_01_sfnt_off0000e915.bin
b59e90053bf26ac61883f1aeb76c1ac0cd9b394b021aa080862b3cc1c9913291		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE915 13088 bytes

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