Malicious PDF — malware analysis report

Static analysis result for SHA-256 667b56c1fb7f829f…

MALICIOUS

PDF

69.0 KB Created: 2020-11-22 19:06:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 456ec32bd4394621ea9063ae7d0418e7 SHA-1: 5b872c88d70d15e69bb4490c65733fb1c4b2bfa5 SHA-256: 667b56c1fb7f829fcb48b309178a18d2f43eedde4a52576a4e9324195247697d
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many of which are part of an SEO link farm designed to redirect users to malicious sites. The primary redirector URL is 'https://traffnew.ru/aws?utm_term=ansermet+royal+ballet+gala+performances', which is likely used for phishing or malware delivery. ClamAV detection and ML classification strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0'.

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=ansermet+royal+ballet+gala+performances PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401518/normal_5faec9e7059b5.pdfIn PDF document text
    • https://sagojuxejuzogug.weebly.com/uploads/1/3/4/5/134598596/5017178.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403413/normal_5f9d65eacd039.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367919/normal_5f8b7f9c06ab7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425926/normal_5f98e8b98283e.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/memul/vukibutudegajaxirorekizo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fc1e515-4d0d-4658-aa5f-df47c8ed90d0/sisexab.pdfIn PDF document text
    • https://s3.amazonaws.com/juxatop/on_the_good_ship_lollipop_shrek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e87b7405-aa81-4d08-84ca-a89de353b402/basketball_legends_halloween_unblocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/492c5198-8212-4e0c-8e4c-ba6f162db543/bobegekosanudevaxifu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/859480b5-6b5e-4c01-a62c-620f63f29ac3/29549830403.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ee70366-3c4e-4218-b7cb-7a328ad7a287/best_mobile_vr_headset.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_off0000d1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E1 5564 bytes
SHA-256: 7da000fa6ca891f2e69dfd10504f6bf575a1c4d16b5efa0872b061cade522b5d
font_01_sfnt_off0000e4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C4 10144 bytes
SHA-256: 44196b3ab826c48a4cb42fc47f35603c2357e83bb025abff3fc47059d8508554

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