Malicious PDF — malware analysis report

Static analysis result for SHA-256 db6af5741fb15d9c…

MALICIOUS

PDF

182.5 KB Created: 2020-11-25 08:51:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: aac1c4c0dc132fbfa40ca24517b176f8 SHA-1: b0220f5b661be43545e158ef1908b2ac82eae43d SHA-256: db6af5741fb15d9c7159f0e7e9a4ac87318d2e0710827069f2da4afeed4fb0e5
194 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a malicious redirector, specifically designed to lure users with the promise of free content like 'bartending for dummies free pdf'. The primary URL identified, 'https://gettraff.ru/strik?utm_term=bartending+for+dummies+free+pdf', is flagged as a known malicious redirector. This suggests the document's purpose is to trick users into clicking the link, leading them to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/strik?utm_term=bartending+for+dummies+free+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4409092/normal_5fb4930fa288b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393358/normal_5f90c697c1674.pdfIn PDF document text
    • https://lisefemibumosu.weebly.com/uploads/1/3/4/3/134339955/8659590.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393345/normal_5fb03d65c36b8.pdfIn PDF document text
    • https://nixabuvibowigev.weebly.com/uploads/1/3/4/3/134308208/9167366.pdfIn PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/6190186.pdfIn PDF document text
    • https://bilimetib.weebly.com/uploads/1/3/4/4/134435282/juredoparudavix_tugofu_dukeko.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/2fe530ea-305c-4126-a9e5-7478bbed4a5c/queen_emma_crinum_lily.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/033d375e-b547-4e94-aa90-87f7ba7c4965/surah_al_kafiroon_mishary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e51b635-b98e-49c3-b405-90bb889783d4/bapivobepodabokimeraxigi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d398acc-ab93-4bd7-872b-efb63dfd607c/98823081404.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1ba6ecb-fa0d-4d29-9cc1-5e8317a0f796/21473116121.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/mods_for_minecraft_pe_apkpure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/966988f9-cdb7-4828-8672-8fa4d6350b07/mekate.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00027648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27648 5380 bytes
SHA-256: f65b213645257c59553d99de04f68e29769fc3f93920576fb9bc83e05cc2201c
font_01_sfnt_off00028886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28886 14092 bytes
SHA-256: 87dccd3f3e8cfc9c0eab277a34d591f48205a108e7e7fef84d27ef5c73e068d1
font_02_sfnt_off0002b616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B616 16172 bytes
SHA-256: 828e46e66afd3578613d92e2c5bba82d81717cec5757370f6bddf23ecdb16da7