Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f6ba19f25a0fc7…

MALICIOUS

PDF

85.3 KB Created: 2021-05-09 01:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 0f1813eb8fc7c48c86ed91917eb33274 SHA-1: d8ba155a84933dd4983ed5e23fead0154ecd6061 SHA-256: 83f6ba19f25a0fc7b190b75e711d82346efa6a8c50608cdfbcbd677fe0b1a513
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of malicious activity, likely aiming to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://jumiwimov.ru/strik?utm_term=classical+guitarists+who+don%2527t+use+nails PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415045/normal_606a5298706d4.pdfIn PDF document text
    • https://jibozupokolojub.weebly.com/uploads/1/3/4/6/134667483/xubasozozozepifituze.pdfIn PDF document text
    • https://rulorakaduf.weebly.com/uploads/1/3/4/4/134480735/c2cb411fa93e12.pdfIn PDF document text
    • http://thiswaytovogue.com/bowflex_xtreme_2_parts_for_sale903kn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500001/normal_5fd368ea3b540.pdfIn PDF document text
    • https://xavamukunakupa.weebly.com/uploads/1/3/1/4/131437969/d738d840f4464ae.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/fhcjcie/89098965750.pdfIn PDF document text
    • https://gawenowufiwozup.weebly.com/uploads/1/3/1/3/131383543/kuzomerinix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476936/normal_604b9fd28c6de.pdfIn PDF document text
    • https://cdn.sqhk.co/fetebutujo/icrhaje/64526529778.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384145/normal_6062ae3ce02b4.pdfIn PDF document text
    • https://nurosamemozixa.weebly.com/uploads/1/3/4/3/134375837/mazufujagobazef.pdfIn PDF document text
    • http://jnatural.space/82457755306a0a4a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470696/normal_5ff667103840d.pdfIn PDF document text
    • https://cdn.sqhk.co/wifukatar/wktiihd/ziribobu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483083/normal_601d4e2e03b00.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
    • http://pasazaxara.rf.gd/bhairava_tamil_movie_bgm_free.pdfIn PDF document text
    • http://tizivuzixoj.epizy.com/45649823722.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED46 5232 bytes
SHA-256: dd32589d4cd322187f4131794d2a9eda66a2d7a0fba98c5f0ee715f6313d286e
font_01_sfnt_off0000ff19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF19 10864 bytes
SHA-256: 4e2175382c79bdf7a80070a62d20a7e2b9ededb9d982bc873426e37e4b7de8df
font_02_sfnt_off00012444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12444 16192 bytes
SHA-256: b80dcff4b26782ff2bd1ed82e01ce9053ba91b1a5afb9bea673378648d26bec5
font_03_sfnt_off00013954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13954 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333