Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8a3567cf83caf9…

MALICIOUS

PDF

67.8 KB Created: 2020-12-21 07:51:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 7ce62b5a7f3d806f6975dd36b4dfe3b0 SHA-1: 2c2cd556d595e12445d756c8f2191e5d958121e5 SHA-256: 9f8a3567cf83caf9ee5a5d179150fe362672f24284ccf75ff2a20a5ff6f83113
156 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, a common tactic for SEO spam or phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URL `https://traffnew.ru/123?utm_term=bettervent+indoor+dryer+vent+home+depot` is likely the primary lure, disguised as a product search result, to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/123?utm_term=bettervent+indoor+dryer+vent+home+depot PDF link annotation
    • https://tejojapifofomo.weebly.com/uploads/1/3/4/3/134339563/vudebad.pdfIn PDF document text
    • https://vesixogis.weebly.com/uploads/1/3/4/8/134863987/6209603.pdfIn PDF document text
    • https://duzareledibasa.weebly.com/uploads/1/3/4/8/134890493/3136854.pdfIn PDF document text
    • https://gokipeko.weebly.com/uploads/1/3/4/3/134351508/ac8032a491a522e.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/ed172fd0-ed00-41bb-abac-ee3d0d78d17e/tusegutivove.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe03771972c46e3c65ed70/1606288253389/59410358945.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4ee917d0c8f249d5ab94b/t/5fcd0ac183d2ac65cc17b8f9/1607273154168/49922835622.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/712d3431-2ef0-48d0-98aa-20441a457561/galaxy_siege_2_walkthrough.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a57bfe1d-d3df-40f7-8f54-b74aee12c9d9/71155466363.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29b7f77b-d460-48d3-856f-c5a1bba42e3a/61199665128.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/697fdc7a-0ce8-4b05-bb07-339efa65d336/jibisanamaxow.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce936b8c6bbc1c89084212/t/5fd6d169acac596b0ccb9a7d/1607913834585/fiwasonubeloja.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdf5a7351e6b539731d3cf2/t/5fdf722ffb7de13a646d9aaa/1608479280327/tn_12th_chemistry_book.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/57801163543.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_off0000cb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB44 4988 bytes
SHA-256: d012d5b22f3389d454a0bb1e93cfb9b69de5dfc1d0ddc293ed19e6e71dee2786
font_01_sfnt_off0000dc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC22 11212 bytes
SHA-256: d0d9e745f7a501c48160ec520307eaec80fa69354d95c3cf4440a27bf436dfa4

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