Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a8315cc32d954d…

MALICIOUS

PDF

84.5 KB Created: 2021-02-16 21:46:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 037d3e806104f04fa3b66b51d31b17c3 SHA-1: 8ef4b549f1fdfa6fbfb1895514380035bdc420eb SHA-256: 45a8315cc32d954d14c2e27f4b73b988f590b0639e6f46bf4083824d044ede5b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or ad fraud schemes. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/wb?keyword=can%20gamestop%20fix%20my%20xbox%20one%20controller PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4455670/normal_5ff5b0ce41314.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501201/normal_600d387a37507.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426545/normal_6024249d73d15.pdfIn PDF document text
    • http://odemebayisitrafik.com/aromatic_nucleophilic_substitution_reactionv5tjk.pdfIn PDF document text
    • https://xiwupegolowiba.weebly.com/uploads/1/3/1/6/131606046/f0c13c3f.pdfIn PDF document text
    • https://polovetanofup.weebly.com/uploads/1/3/5/3/135330247/direvidevizovov.pdfIn PDF document text
    • https://sidutoxa.weebly.com/uploads/1/3/4/8/134886075/4465243.pdfIn PDF document text
    • https://pibiwija.weebly.com/uploads/1/3/4/8/134896476/xiwunemikubokozopi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488101/normal_5fd08d94cc3b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445116/normal_601418077d107.pdfIn PDF document text
    • http://copyright-central-media.com/85907579968o0roj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489440/normal_5fccd4050662c.pdfIn PDF document text
    • http://health-top.ru/vivo_video_maker2s8bv.pdfIn PDF document text
    • https://pexigupor.weebly.com/uploads/1/3/4/9/134901766/papatogefowene.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/bisazabe/screen_capture_on_samsung_android_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/58383344683.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/bones_formed_by_endochondral_ossification.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/esmo_colon_cancer_guidelines.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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF9 4228 bytes
SHA-256: 77311e71bc4f59606513ccf965b833043c0ecb36aca87818f4b12159563541a9
font_01_sfnt_off0000fa05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA05 5548 bytes
SHA-256: 95f187cec3d668d3cd6b533c545cc2aa2ac697a5c86199c60ecaf9a015ea8447
font_02_sfnt_off00010cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD3 5824 bytes
SHA-256: 49aa593dd77a1e59eac4b16478431417f615ccf8ebc95f538f1a17958407b1d5
font_03_sfnt_off00011b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6C 12396 bytes
SHA-256: 0c6eb3e6b1bbcb6e7da0a37e2a4090ae04048f772a4ae0b1fb7d4de23bbaa96d

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