Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0205208d9fa0ef4…

MALICIOUS

PDF

117.4 KB Created: 2021-02-24 15:41:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 902baae4a83225d348844a01f6214c17 SHA-1: 141cfbd1a498cf3afd46c70c039767978d379341 SHA-256: b0205208d9fa0ef452cd14ee8eb5b7a4bb696d0d6e04d7c7c67ae671d7158640
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful content or further stages of an attack.

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://bologen.ru/award?keyword=d%2527link+dir-615+router+repair+guide PDF link annotation
    • https://gegixigozazewit.weebly.com/uploads/1/3/4/8/134858275/54146d364f586ec.pdfIn PDF document text
    • http://sabofogetazo.22web.org/tujimazamej.pdfIn PDF document text
    • https://mixuzurul.weebly.com/uploads/1/3/2/3/132303374/3b9b6d.pdfIn PDF document text
    • https://zesaxigupube.weebly.com/uploads/1/3/4/0/134016892/6569026.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383579/normal_600de0c506b3b.pdfIn PDF document text
    • https://cdn.sqhk.co/gunobawiwax/cGjejho/skyblock_map_download_planet_minecraft.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450889/normal_603247bd0606c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447258/normal_5fd6460a28487.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453740/normal_5fe17e7d35b29.pdfIn PDF document text
    • https://cdn.sqhk.co/mibupufek/icNIljh/98018236758.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416789/normal_5fd1e51c4542a.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/jeworurowam/sujalosazul.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/13637775346.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_off00017fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FD4 5288 bytes
SHA-256: fdb3430cc61cc2615febf50f4aa175f0c5fda99f4ddbf0ef6131d1a6aa5d4245
font_01_sfnt_off000191e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191E9 12188 bytes
SHA-256: 9d642033a6fa66bf0cbc5798d99005b570bfdae13d67cc03950bbc2634503b0d
font_02_sfnt_off0001ba23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA23 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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