Malicious PDF — malware analysis report

Static analysis result for SHA-256 351e78ada33c85b6…

MALICIOUS

PDF

75.7 KB Created: 2021-05-24 05:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 43d4b62c7a7eeb443bbd523654d28002 SHA-1: 274d063ec4c989c8315acc9b32bace04829e3363 SHA-256: 351e78ada33c85b627f1c51ed02d8abebc8443642a0a9561c99d9dbfb3f26671
156 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is malicious, including a ML classifier flagging it as such and ClamAV detecting it as a phishing trojan. It embeds external URIs, with one prominent URL pointing to 'fokemale.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to installing an emulator, likely a lure to direct users to the malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://fokemale.ru/strik?utm_term=how+to+install+rpcs3+emulator+on+pc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387806/normal_601e22e378da1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494889/normal_605f77c0aeeec.pdfIn PDF document text
    • https://javeleguf.weebly.com/uploads/1/3/0/8/130873961/ninevasetanebibaxu.pdfIn PDF document text
    • https://dupevolorimix.weebly.com/uploads/1/3/4/5/134588768/7405689.pdfIn PDF document text
    • https://lawuzifelive.weebly.com/uploads/1/3/4/0/134041442/wamavebezubif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382784/normal_5fcc71421056a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bad0601-fdb1-4c27-bc7b-3e224f768f07/roku_model_3920x_replacement_remote.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/christian_grey_character_descriptions.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/74674997069.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/the_happy_body_workout.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/dafomumomirobowo.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/caama_music_s.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/66240184443.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/how_to_increase_height.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/supobakamekod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fce402f-dab8-448a-af38-453f1d31ab29/49633343299.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/lee_reloading_powder_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/eye_makeup_brushes_guide.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE645 5296 bytes
SHA-256: d878a9d539f95a38405f51cee17dd03084cca061727f8a78894b24d7eb7ab3c9
font_01_sfnt_off0000f841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF841 13040 bytes
SHA-256: 13a5dfbfa9c6872e6ce777f5b8dca7fdc264121208e67a4b2ebcc5a5c19ad283

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