Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7fdb091e5e871bd…

MALICIOUS

PDF

87.3 KB Created: 2020-12-21 19:11:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e0765a729e7dccf7576f9c46fd735e56 SHA-1: dca692604638027f03d439804bb25748bbe82710 SHA-256: f7fdb091e5e871bdd557c7ba30d2b60faf9410263fbf8e3a509526345b50a1d1
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document employs a link farm and SEO redirection tactic to lure victims into downloading further malicious content, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK heuristics. The embedded URLs, such as 'https://trafffi.ru/aws?utm_term=balance+sheet+and+income+statement+template+excel', are used to facilitate this phishing attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

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://trafffi.ru/aws?utm_term=balance+sheet+and+income+statement+template+excel PDF link annotation
    • https://wipomozexabezi.weebly.com/uploads/1/3/0/7/130776841/933ecd905dd.pdfIn PDF document text
    • https://devejibotabakap.weebly.com/uploads/1/3/4/7/134702496/rufikilu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380701/normal_5fb27e50cb29d.pdfIn PDF document text
    • https://gezeteweni.weebly.com/uploads/1/3/4/0/134040803/4887618.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366057/normal_5fab7e9e0ec80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410989/normal_5fc96032219fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444626/normal_5fc173dd079bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373248/normal_5f91c4b24d23b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388293/normal_5fa0475c179aa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/541cc74e-30b2-4b16-895f-9af97d3cb1a2/activation_code_for_cleanmymac_3.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc12a1c9698b02c7f224c6f/t/5fc2d263bc819f1cf4360ef8/1606603364344/polk_psw10_review.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2a167cd1e280355df4762/t/5fc647f49d7936484062ce15/1606830068644/nabumev.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2886e92c50b1a1e81da22/t/5fc486873f75b16643652ae9/1606715015393/21334703082.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8a32e45-6da8-46e6-a7bc-be940905a3a7/sezajukumijilexixejeluw.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_off00011949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11949 5332 bytes
SHA-256: 56a556434d2adf2dc28d4d0388817e8e6a2ed2184d986d50d709112fa6bd00b6
font_01_sfnt_off00012b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B48 10752 bytes
SHA-256: 0a1959bb6da5400c801b3b88e55f072158bd54617f04119601864c8bbc55da58

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