Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9d5b9c119e77e1a…

MALICIOUS

PDF

96.4 KB Created: 2020-11-20 04:28:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb8ef4a6a3aa446ba7be03f2679f78ff SHA-1: 1827effe3ab09a088480a0cd26d492421a94110f SHA-256: e9d5b9c119e77e1a0653f2887eb14f477214ebbc3a18b6c4c89ac94b9636cbe3
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically identified as a redirector to malicious infrastructure. The ML classifier and ClamAV also flagged this file as malicious. The embedded URLs suggest an attempt to direct users to potentially harmful sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://gettraff.ru/123?utm_term=diferencia+entre+estado+y+gobierno+wikipedia
    • https://namokokesovu.weebly.com/uploads/1/3/4/4/134480524/1735909.pdf
    • https://cdn-cms.f-static.net/uploads/4418000/normal_5fa95586c3890.pdf
    • https://ziripovopibew.weebly.com/uploads/1/3/0/8/130874468/venemi_raxatesugaze.pdf
    • https://cdn-cms.f-static.net/uploads/4449775/normal_5fac4f722c288.pdf
    • https://cdn-cms.f-static.net/uploads/4372673/normal_5f8abc802caf2.pdf
    • https://logekififej.weebly.com/uploads/1/3/4/5/134502341/lekalosujutatu-demux.pdf
    • https://cdn-cms.f-static.net/uploads/4452595/normal_5fa5e089d0c25.pdf
    • https://cdn-cms.f-static.net/uploads/4417319/normal_5fae19a762518.pdf
    • https://cdn-cms.f-static.net/uploads/4454670/normal_5fa14d92d5c76.pdf
    • https://cdn-cms.f-static.net/uploads/4457843/normal_5fb48b655ae60.pdf
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/xojajuv-mitegejitokuxig.pdf
    • https://cdn-cms.f-static.net/uploads/4426088/normal_5fa236495f944.pdf
    • https://zazusixalug.weebly.com/uploads/1/3/4/4/134491239/3b035b2c40ba97.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/c2a14814-f38f-4164-acfc-ff497db5edce/delubosasozuluxodu.pdf
    • https://uploads.strikinglycdn.com/files/8d58cd61-74d2-4fb5-898b-741f6695a71c/tuloliligononimadixuzag.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_off00012aab.bin
8876a0db2bb744a882ab4a31859a46eda0dca2f79644253854ada353c44dec41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAB 5476 bytes
font_01_sfnt_off00013d6f.bin
d014cec63c84bfbecdde9f44a7a7c89991e8b0b8a4b196d1bbf651bd5649d0f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D6F 11916 bytes
font_02_sfnt_off00016460.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16460 4324 bytes

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