Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f2de011c667e4c…

MALICIOUS

PDF

40.1 KB Created: 2020-11-06 03:38:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8a10cf4feaffd2b0c7ef0a32d2583a6d SHA-1: 9785fea3838b47ced63f7cbb9d05ab56d5387c4e SHA-256: 78f2de011c667e4cabe89dce2dfe0c272d4fde3dca89bc00a041801f5c9702d6
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to other PDFs hosted on cloud storage services, suggesting a link farm designed to manipulate search engine results. One of the primary links directs to a suspicious URL, 'https://trafficel.ru/aws?keyword=painting+wonderland+in+queen+creek+az', which is likely part of a phishing or malicious redirection scheme. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://trafficel.ru/aws?keyword=painting+wonderland+in+queen+creek+az PDF link annotation
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/f0db96f6987eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381104/normal_5f977f0727031.pdfIn PDF document text
    • https://jopomewimedadi.weebly.com/uploads/1/3/4/4/134465277/memub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367283/normal_5f8873d7dd6b3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/regufojalojaza/34177640361.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4327d5f6-3f78-49fb-bbf2-9e9f17bba4d7/nisumubulonufe.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/luwulu.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/overhead_door_rhx_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/gang_beasts_2.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/highest_scoring_nhl_game_2019-20.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/pokemon_strategy_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32b85b7d-e823-4137-8027-d60dd70866b2/12971656232.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4CE7 5144 bytes
SHA-256: 3cae1f11ec74030b5b4a7b278435582286d4a5f73b9c1c541b57e61705274d7e
font_01_sfnt_off00005e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E7B 11792 bytes
SHA-256: 5d99c4c28db10db80cd4240457401a377f3f5a593b6cd32e362250bbd5b18fc6
font_02_sfnt_off00008595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8595 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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