Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f96a4534a9f9fd…

MALICIOUS

PDF

80.0 KB Created: 2021-05-08 14:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8d3066169fc9cdd381e7772554963020 SHA-1: c5253764e8390e4421a6bf4d56a547287ac1a847 SHA-256: b9f96a4534a9f9fd16d7e1f58c16e843bd0275b33c193a2ed9061989bc72e6ea
126 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to disposable hosting or redirectors, indicating a link farm or SEO spamming operation. One of the primary URLs, https://mezovuduw.ru/strik?utm_term=kenwood+ddx672bh+reset, is flagged as suspicious and likely leads to a malicious site. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially harmful content, possibly as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://mezovuduw.ru/strik?utm_term=kenwood+ddx672bh+reset PDF link annotation
    • https://kiloroxo.weebly.com/uploads/1/3/0/8/130813762/7146475.pdfIn PDF document text
    • https://cdn.sqhk.co/zetuzire/gd1TWhe/51759983406.pdfIn PDF document text
    • https://bovikobugekut.weebly.com/uploads/1/3/0/7/130775803/16c36ef73ef4.pdfIn PDF document text
    • https://cdn.sqhk.co/kusewupudin/dqiegfK/79503168494.pdfIn PDF document text
    • https://kibajalixil.weebly.com/uploads/1/3/0/7/130739780/mefodaju.pdfIn PDF document text
    • https://nanavefog.weebly.com/uploads/1/3/0/7/130775134/658f2760c7e.pdfIn PDF document text
    • https://mizovitima.weebly.com/uploads/1/3/4/2/134266674/c5a6d3b5b.pdfIn PDF document text
    • https://cdn.sqhk.co/vatomepipiw/hXigij2/hidden_objects_enchanted_kingdom_2_walkthrough.pdfIn PDF document text
    • https://derigibi.weebly.com/uploads/1/3/4/4/134447264/pafidaju_pedapugimidok_gebifizaj.pdfIn PDF document text
    • https://fejevudud.weebly.com/uploads/1/3/2/6/132695511/60e50e0564be31.pdfIn PDF document text
    • https://cdn.sqhk.co/sixerusesebu/jiKjgji/raspberry_jam_bars_ina_garten.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/f0a648f2-00e8-4df3-8fb1-05ed350eb2b8/how_to_score_bean_bag_toss.pdfIn PDF document text
    • https://c534e673-b245-4a6d-8787-855fe96db707.filesusr.com/ugd/e19215_caad0deb59944097af173e4bca2e9640.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kegovev/49747398077.pdfIn PDF document text
    • https://ede36962-9452-4451-b182-fa4236ba9bc6.filesusr.com/ugd/83b1b3_64aaa8bfe5414c359b20ba2181c20141.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/386645c1-e548-468c-9938-b182149f274e/john_deere_110_backhoe_attachments.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/41823347199.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e98302f-a6fc-4578-88fc-07c35fa4b5c0/que_es_educacion_fisica_recreacion.pdfIn PDF document text
    • https://fb3efafe-1b0e-41a1-9434-8bf556110c4a.filesusr.com/ugd/de5e41_e122691d815747759d1705cb1e80f21e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bde517da-8cb5-4f63-b7bf-64723c4917aa/junavavevopix.pdfIn PDF document text
    • https://070488ba-e3d9-4c74-834b-445551f5513c.filesusr.com/ugd/fb83f1_3c691b8c9e1940ea9a759d9f787f6d78.pdf?index=trueIn 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_off0000fa08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA08 5308 bytes
SHA-256: 5f2a22525edcf80a9565a0a37c2b428e714c3f854c9e126fc7abe439d963dc32
font_01_sfnt_off00010c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C35 11372 bytes
SHA-256: 7770b75bd9b39b0de227efc3dd373d293dc67b4fb7afffe9c8f2197f2b11f4b5