Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a7d565215ef0f5…

MALICIOUS

PDF

73.1 KB Created: 2020-11-22 06:02:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc2c6694c89e9d79ab5b78113d774077 SHA-1: 14d063a2ee21ef5f4f09fbea21e32799c2e10006 SHA-256: 89a7d565215ef0f5c90a3455c1069ee7e9698646981794b15bfa97f00b342ad8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffine.ru/123?utm_term=volume+of+a+solid+of+revolution
    • https://gomosoganerat.weebly.com/uploads/1/3/4/4/134494513/9402377.pdf
    • https://diziwupufetut.weebly.com/uploads/1/3/4/4/134477772/rigafomila-laxesobotixe-dalupeji-jedopijefag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nowokil/club_penguin_mission_7_cheats.pdf
    • https://s3.amazonaws.com/sinamozagemoger/24212925567.pdf
    • https://uploads.strikinglycdn.com/files/5b988b12-4bb1-4f12-9f08-057264afd5be/bissell_deep_clean_deluxe_pet_instructions.pdf
    • https://s3.amazonaws.com/sukedil/29395501446.pdf
    • https://s3.amazonaws.com/kizuporowefib/lejokusinifasobake.pdf
    • https://s3.amazonaws.com/tarajix/blue_ombre_xpression_braiding_hair.pdf
    • https://s3.amazonaws.com/lijulijowivaze/tavoxojetipasopedaxolosa.pdf
    • https://s3.amazonaws.com/bulozor/ouran_host_club_twins_x_reader.pdf
    • https://s3.amazonaws.com/dukajevo/pdf_editor_online_free_no_download.pdf
    • https://s3.amazonaws.com/tapexiw/damedigomukod.pdf
    • https://uploads.strikinglycdn.com/files/a2decb5d-8e30-43e9-a9f6-27451fd7d68f/harlem_by_langston_hughes.pdf
    • https://s3.amazonaws.com/sepovutapakogaf/72848307877.pdf
    • 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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c847.bin
10a07fc969e6c8cf41398fcfefa625e426b29a45b33f3716d0886db1405c0d2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC847 2900 bytes
font_01_sfnt_off0000d28a.bin
a6846ec7ad825861932e27b52c08c707c5257966cf44743a2d28d016e55c0d1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD28A 5080 bytes
font_02_sfnt_off0000e3bf.bin
6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BF 3720 bytes
font_03_sfnt_off0000ef22.bin
dbf3faad6fd81ef609df884403c7cd7a954a1eb97021ce7472b6c96014ce7589		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF22 11556 bytes

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