Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a891ac05fdbb17…

MALICIOUS

PDF

74.6 KB Created: 2020-12-07 11:58:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: ef25519e01ea439452546a96c91f5918 SHA-1: 1a3665852654e4f234d2969854b387239c979169 SHA-256: b5a891ac05fdbb179915d1391c45d4b23fd83b726711156c3e6523e3bcbfcd14
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://traffnew.ru/aws?utm_term=arcane+trickster+level+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379362/normal_5fa761d84aeea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368222/normal_5fc3fda1b0b13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368226/normal_5f876b7b036ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387052/normal_5fc6453421942.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366348/normal_5f8f9a0b2749e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365549/normal_5f8e98e0bc8b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382421/normal_5f9c8a7d72597.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377115/normal_5fa776d65bf02.pdfIn PDF document text
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/rezumojen.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/dudurat/online_wage_statements_cbocs_w2.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/air_conditioner_remote_control_app.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/rubber_sheet_flooring.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/original_cabbage_soup_diet_recipe.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/wokil.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/68083470294.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_off0000e910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE910 5220 bytes
SHA-256: f0b01e4463ce280233dff248614a9d276a53669e6c06605a93b85000aa78d7af
font_01_sfnt_off0000faea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEA 10192 bytes
SHA-256: 410e1ecf7f9ba07002b9ab139473221e7fccb2306f6a22b538574f1b80c04edd