Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f41d7d2eaa488bb…

MALICIOUS

PDF

50.9 KB Created: 2020-11-06 14:51:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: 72f91a3fc1243f2ddf5dfc71df5a2fc8 SHA-1: 93ed8b6d14609466fca18280cd4d92aabc82f93a SHA-256: 8f41d7d2eaa488bbc1f34ebe8053ba9e518218ec7f094db4cb96b535a0e6ec61
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/123?keyword=words+with+scope+in+it PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381751/normal_5f93f39e2956d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369653/normal_5f8d33cc63144.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367645/normal_5f8762322584b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381738/normal_5f9dd17047186.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373264/normal_5f90babe8164e.pdfIn PDF document text
    • https://gemamiji.weebly.com/uploads/1/3/4/3/134372226/1020583.pdfIn PDF document text
    • https://tagepixibupiz.weebly.com/uploads/1/3/4/5/134586800/e0ef933e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427076/normal_5f9978244d8de.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/bededuxotulapil/irish_battle_axe_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/68836736899.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/287ee5b3-cd93-4a83-929e-9a7d367b812f/20882709263.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/bash_shell_scripting_basics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af5dc6d2-be43-4341-963c-75bc3e6bb6c4/sewatuxewibetimalezijila.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/boston_terrier_lab_mix_temperament.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_off00008790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8790 5024 bytes
SHA-256: 7eabddfe34d1d5847fd1f3bf6134e2d26235804600f9e8be81c864944f92f75e
font_01_sfnt_off000098bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98BC 11100 bytes
SHA-256: 3894de5f4724e97fe63aac7b7f82565443e917e7fe7293436ea7fd02076be09b