Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ffb1bfdfbf1b8c…

MALICIOUS

PDF

75.4 KB Created: 2021-03-24 15:44:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 17ae5c418c1ae510c027c174e5258e5a SHA-1: 67b138b0fd44e5734979ca6a761ba87f97819789 SHA-256: b6ffb1bfdfbf1b8cb90ea57a12089c66afc8570f456f0bf04861835006dab1ae
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which point to SEO-optimized content, and one specific URL is identified as an SEO redirector for a 'free-download phishing' lure. The document body, though heavily obfuscated, contains references to 'bedford school district pa' and 'wkhtmltopdf', suggesting a potential pretext for the phishing attempt. The presence of numerous external links indicates an attempt to direct the user to malicious content.

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://vilenefex.ru/wix?keyword=bedford+school+district+pa PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501479/normal_60299ad99161a.pdfIn PDF document text
    • http://azalea.store/78336640432z3prj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389355/normal_5fc6cae6975ef.pdfIn PDF document text
    • http://arfesopt.com/79119397766gryys.pdfIn PDF document text
    • http://5coupons.info/kitchen_pro_breadmaker_67304pzgv.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/potofaw/factors_affecting_bacteria_growth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba34e6ce-0059-4876-b894-1fa976e375d2/23083925236.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/rasunorijeripu.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/apple_logo_hd_images.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85056f15-aaac-49ed-9e13-9fde361b6f61/veludulijumux.pdfIn PDF document text
    • https://6b21c484-99f8-4e97-b77a-b77c054bfe5d.filesusr.com/ugd/f139d4_7bcf4d2ed3744e5ea91175dba944de1b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6f92e0e-9baf-44b4-9f45-0dea5448127e/how_many_calories_in_an_arbys_beef_n_cheddar_sandwich.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/4661418972.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/mobarepamorira.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/76186966642.pdfIn PDF document text
    • https://ee6e56e8-c390-49d2-810b-d4defef8b9c1.filesusr.com/ugd/eda187_6d578032abbd4756bbd44073623445a7.pdf?index=trueIn PDF document text
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_f9f6d587d073425883242de560fcf84d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bofake/83753033153.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/lasofofoxekevoginimif.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_off0000e499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE499 5292 bytes
SHA-256: 633426d3f802c6ebb2c9058aa73e84678967dfc30d3aaf030823984fbd405fe8
font_01_sfnt_off0000f69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69C 12032 bytes
SHA-256: d87102196943f16f25881762c9ac7c73943f5f291616172a4af6c6ec107214a5

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