Malicious PDF — malware analysis report

Static analysis result for SHA-256 390ac6a155b3191e…

MALICIOUS

PDF

77.5 KB Created: 2021-05-21 06:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45d6fa745318d4ebe90829f3a636eab1 SHA-1: 1e0ef54e76d62d79d97b0520db42204d0fc59129 SHA-256: 390ac6a155b3191e317bbab84170355f1501946af4bbeb0daa5220761bee862b
156 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating it's a link farm, with one prominent URL pointing to a suspicious domain. The document body, though heavily obfuscated, appears to contain product search terms, suggesting a lure. The presence of external URIs and the ML classifier's high confidence score indicate malicious intent, likely for phishing or malware delivery.

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://xezojetit.ru/strik?utm_term=blaupunkt+radio+asm-3+band+cd+player+with+mp3+aux
    • https://static.s123-cdn-static.com/uploads/4416669/normal_5fc9451d36ec2.pdf
    • https://cdn-cms.f-static.net/uploads/4413567/normal_605c892a5e0b1.pdf
    • https://cdn-cms.f-static.net/uploads/4477401/normal_6041c5d8a41af.pdf
    • https://cdn-cms.f-static.net/uploads/4491946/normal_60693e76e0dbc.pdf
    • https://cdn-cms.f-static.net/uploads/4409606/normal_5fd935ac10a1d.pdf
    • https://cdn-cms.f-static.net/uploads/4411944/normal_60137167c88e3.pdf
    • https://gawakugoful.weebly.com/uploads/1/3/4/7/134757428/benuxivobin_xolotu_fifawamukajegu_mowerenure.pdf
    • https://cdn-cms.f-static.net/uploads/4454303/normal_6052ac8117205.pdf
    • https://vademakab.weebly.com/uploads/1/3/1/3/131380849/abb954467317b8.pdf
    • https://cdn-cms.f-static.net/uploads/4453537/normal_600a76044f71e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d7df89f7-1c69-4b4e-99e6-dee94da8a384/the_maze_runner_2_free_full_movie.pdf
    • https://uploads.strikinglycdn.com/files/6c1fb6f4-6e2f-460a-85e4-0d286dd97a71/what_kind_of_battery_does_a_vicks_thermometer_use.pdf
    • https://uploads.strikinglycdn.com/files/f6aff400-9b62-4296-b033-4efe50a40fa8/98479745573.pdf
    • https://s3.amazonaws.com/nosepevozux/flowering_plant_reproduction_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/c75a9446-ec1f-4079-bce9-e97d486f7c79/69871905780.pdf
    • https://s3.amazonaws.com/jijumupade/batman_the_dark_knight_rises_480p.pdf
    • https://s3.amazonaws.com/mikibetiv/64478193527.pdf
    • https://s3.amazonaws.com/xujitezu/types_of_road_cross_section.pdf
    • https://uploads.strikinglycdn.com/files/1b5dd28b-0d9f-42e9-bf96-62784b0c6e07/49890674037.pdf
    • https://uploads.strikinglycdn.com/files/efbfd7a5-de75-4d93-97bd-4c6ec89f971b/richard_iii_clarence_death.pdf
    • https://uploads.strikinglycdn.com/files/0e3a7730-8479-4e66-afbf-889df3420d88/how_to_take_hair_dye_off_eyebrows.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000debb.bin
bf915070d8bb7b1e8dc1c7220c0f59c1556671f440da34464b8f2809d97dbc05
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBB 6024 bytes
font_01_sfnt_off0000f326.bin
cff4ebb393fd9b228989afc478b55e609a76d5e23ba5de3077c57cf6226d194c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF326 4076 bytes
font_02_sfnt_off000102a2.bin
83a67485de1895fcbedf1e69470ddb167de49ba39aa000eb94de44e51ae426a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x102A2 11816 bytes