Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ddb6b2ff88ea898…

MALICIOUS

PDF

67.8 KB Created: 2021-03-22 12:47:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05fa5880ebe63f3500e8d4c31ef0b8a6 SHA-1: d70d2e86d5a4b4a0f3e1e2e435de356a9e31a641 SHA-256: 9ddb6b2ff88ea8989780be0de5b7ed1a09bcaec312c34009129d50e3467c58c0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO link farms and phishing. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically identified as Pdf.Phishing.Trojan. The embedded URL points to a site that likely hosts a malicious payload or phishing content, disguised as a worksheet. No scripts were extracted, but the PDF structure itself is indicative of a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/wix?keyword=comparing+comets+meteors+and+asteroids+worksheet
    • https://cdn-cms.f-static.net/uploads/4488102/normal_600f1fe217fe9.pdf
    • http://tradestaroffice.com/rokutumegi811x0.pdf
    • http://kigurumi.org/81407189111m4cvj.pdf
    • http://tuwimig.scienceontheweb.net/iphone_camera_scanner.pdf
    • http://cosmosqrab.online/real_steel_wrb_champions_mod_apk2xn54.pdf
    • https://cdn-cms.f-static.net/uploads/4476768/normal_601b471e79777.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pezofut/40816474230.pdf
    • https://s3.amazonaws.com/vajefam/gndu_date_sheet_ba_3rd_sem_2019.pdf
    • https://db38eef3-7d65-43a4-badd-ba39ed7d9417.filesusr.com/ugd/bd2483_273347259a9a49f5ad6a99da57118478.pdf?index=true
    • https://s3.amazonaws.com/mefadedosuw/yantam_marathi_song_video.pdf
    • https://s3.amazonaws.com/bisiku/74796920784.pdf
    • http://fogokenum.onlinewebshop.net/a_thousand_splendid_suns_discussion_questions_part_3.pdf
    • https://ecc4b077-82d2-4cf1-ad45-1e482560a890.filesusr.com/ugd/5d7ac5_f95cbca25ae24a63a419d3dfbed99502.pdf?index=true
    • http://vififaraw.rf.gd/puluzirolimibotifib.pdf
    • http://laganomezavarof.epizy.com/36687413394.pdf
    • https://s3.amazonaws.com/wovigebi/valkyrie_profile_clockwork_mansion_guide.pdf
    • https://7f793f8f-877f-420e-851b-8bae9ea62a4d.filesusr.com/ugd/78c764_8602a885703142949162f01718064543.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca0c.bin
f69fdf610a9992e5dcf0c92abf66cd0487d135b8b67d3f76dbc7fe7a58af7eed
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0C 5516 bytes
font_01_sfnt_off0000dcac.bin
6dc0713fa8be607363537891b360463bb0d64242d33b0eaab1ef65010d541675
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAC 10224 bytes