Malicious PDF — malware analysis report

Static analysis result for SHA-256 8235dbf53fe31cfc…

MALICIOUS

PDF

74.6 KB Created: 2021-05-23 02:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 671b39223b3a22df1f36e81bf652dcbb SHA-1: 02d0d7b76cc2b200cb263d2c81a9bdfa7557e072 SHA-256: 8235dbf53fe31cfc5f4be00259ac967fb82ae25781ab1be3e9e0bbd0d0ccab0b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file exhibits characteristics of a phishing lure, employing SEO tactics and redirectors to disguise malicious content as a workshop manual. The presence of numerous external links, including a primary redirector at 'https://baarspo.ru/strik?utm_term=2019+mazda+cx+5+workshop+manual', strongly suggests an attempt to lead users to a compromised or malicious site. The ML classifier and ClamAV detection further corroborate its malicious nature, indicating it likely exploits vulnerabilities or delivers a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/strik?utm_term=2019+mazda+cx+5+workshop+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464053/normal_601b806d57b01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445333/normal_5fe17075d7b3f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387406/normal_6002a09887389.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476765/normal_600bfb83adc60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483349/normal_601ba949e8765.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446377/normal_5fcc1fd690d2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446646/normal_60562e7d75dd9.pdfIn PDF document text
    • https://dilewujolar.weebly.com/uploads/1/3/5/3/135308995/4bda281ae5815.pdfIn PDF document text
    • https://kejobogufepemis.weebly.com/uploads/1/3/0/7/130775396/a27a79d47160f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404723/normal_603214df7a4b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370547/normal_60159bb78546d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382790/normal_60123952bff79.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458623/normal_5fee64a2be978.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487905/normal_6034198503a1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498376/normal_60507018a0504.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477886/normal_606e2eb6e2f27.pdfIn PDF document text
    • https://mikatafa.weebly.com/uploads/1/3/1/3/131398449/6dc9e43ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467007/normal_6032c9d72db96.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/gazivemon/baldur_s_gate_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/28517737611.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/14042282269.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/pexajuzowusega.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/definition_of_visual_impairment.pdfIn PDF document text
    • https://s3.amazonaws.com/moduluzuxikari/toponafinikiluxujapa.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_off0000e2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BA 6096 bytes
SHA-256: 800f9548a3e113e3181c7814ac14ea7c388cbd2e0922235deb68b7bf711d970d
font_01_sfnt_off0000f775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF775 11040 bytes
SHA-256: c684b60f14aa65fcbf6b08b3d0ba77cda44979e77048d109bcd5b9ea9b80b252