Malicious PDF — malware analysis report

Static analysis result for SHA-256 595602fc435d63da…

MALICIOUS

PDF

46.6 KB Created: 2020-11-09 15:29:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: aeeecb3b019e0e287e54aa75739f6c5f SHA-1: 719e9e86c233beef025d2a4261d69ea23351e13d SHA-256: 595602fc435d63dac0e263b96f6df807d6e5f220280b2c35b7436543480430ec
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking PDF files, suggesting a link farm or SEO poisoning attempt. One prominent URL, 'https://traffset.ru/strik?keyword=frankfort+plant+board+cable+tv+guide', is flagged as suspicious and likely leads to a malicious site. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the structure and embedded URLs point towards a social engineering attack.

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://traffset.ru/strik?keyword=frankfort+plant+board+cable+tv+guide PDF link annotation
    • https://sererepe.weebly.com/uploads/1/3/3/9/133999843/zijeni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375341/normal_5f98eb895aa72.pdfIn PDF document text
    • https://lebidupevi.weebly.com/uploads/1/3/4/3/134319251/gugop_gagunapo_tafefikevumax_nixexidolosutu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407552/normal_5f967519050ba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gedimuta/ejercicios_present_perfect_simple_just_yet_already.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3c5ec8f-34bc-4f75-a153-c49f6c441d5c/91015477001.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/zasimuper.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/louisiana_public_records_statute.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/girodilewajowavawekulug.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/27021898850.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46e385a0-1cf8-4378-8190-911b4e8f8189/78335936084.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/mapasisog.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/man_finds_gold_mine_on_property_police.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/topenugokejorusiluxofep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4ed0999-13a1-4c2f-b7fe-205e5feda992/65024888588.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/the_abc_of_real_estate_investing_book.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_off00007569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7569 5364 bytes
SHA-256: f7240097d6e7712a35388459c633f015b9c89368a7f60562f3d2dade53fea98b
font_01_sfnt_off000087c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87C1 10908 bytes
SHA-256: 7c700ae8fe02ad11f5d5aef4fb875519675a2d8fdfda6e76e2600253c802b2a1

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