Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4ad21f355c831d2…

MALICIOUS

PDF

70.1 KB Created: 2021-03-27 19:41:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d6c0e06ea340d331f9a92afb0674f6b SHA-1: 1379bd2c8216d27f876e15d26b19853f4cc32175 SHA-256: e4ad21f355c831d235f67f60d2dd568eef02437522e8cfa4ec1554905fbd7bf9
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier, indicating a phishing or malicious intent. It contains a significant number of external links, suggesting a link farm or redirection to malicious sites. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/123?utm_term=cherrypickers+guide+2017
    • https://tawozajoruje.weebly.com/uploads/1/3/4/3/134314125/xubotafijawegud.pdf
    • https://xuropowupenuba.weebly.com/uploads/1/3/0/8/130813979/rereweturojun.pdf
    • https://jotogenawe.weebly.com/uploads/1/3/1/4/131406354/fegizibapeju_wanajuro_ketenijekituva_wenoxopuwa.pdf
    • https://wisolowiguwo.weebly.com/uploads/1/3/4/6/134630140/dugilujij.pdf
    • https://wilulesutazi.weebly.com/uploads/1/3/3/9/133997377/fuwow_dimimowotiz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5457524e-bace-410a-9ce7-c8d8bc0eedea.filesusr.com/ugd/f0ffd0_2674ed8174b64d689103175d037e7353.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8bffb77f-054d-4d5a-a1bf-fb5b099fd79c/cask_of_amontillado_analysis.pdf
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_c3f19308b62648c98518742fdf13b98e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/006f616b-9018-467b-8353-7f171be336e5/xakipekopevisejapomu.pdf
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_9f0ca973cd5c48fe9612f43f1377ecc8.pdf?index=true
    • https://s3.amazonaws.com/wefadep/transcription_and_translation_worksheet_biology.pdf
    • https://s3.amazonaws.com/mipizaju/reading_comprehension_strategies_skimming_and_scanning.pdf
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_3147d93cd8014d91aff627bc019d62a1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ffe3dc56-9616-47d1-bc64-632def65fd01/how_long_to_cook_steak_on_george_foreman_grill_well_done.pdf
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_bc35aea66eaf49138a70fe4ade7feb01.pdf?index=true
    • https://s3.amazonaws.com/zolerazowubow/natotifago.pdf
    • https://s3.amazonaws.com/towutoginadivu/25492414472.pdf
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_556b9d62e67b4bec820cb8d991b1babc.pdf?index=true
    • https://s3.amazonaws.com/baritexovopa/79864280565.pdf
    • https://uploads.strikinglycdn.com/files/0887c717-10fe-42bb-8121-83d643167e87/gapuliwolemumibaxededurij.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_off0000d407.bin
bf37167d5e8648ab868d8b54b7c8f6efcb3d829be3f11672f4a8d7771b116441		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD407 5572 bytes
font_01_sfnt_off0000e711.bin
c85e00d28293ba11e05303b4b6e362e603c460546f902bf1521b0670020ee997		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE711 10516 bytes

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