Malicious PDF — malware analysis report

Static analysis result for SHA-256 781b8131ef7a53d1…

MALICIOUS

PDF

77.2 KB Created: 2021-05-02 08:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb1b88bf62c635c93c3d137fe6837008 SHA-1: 0e6591c41871d751af51708f826fb811ef7b77ad SHA-256: 781b8131ef7a53d1ebe21b6bb071bbd13c5aba1f6b79f9efd7c84367dab6d98f
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 are obfuscated or lead to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for distributing further malware or phishing for credentials. No scripts were extracted, but the PDF structure itself is used to host and link to external content.

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://pelibifir.ru/strik?utm_term=online+spoken+english+course+in+kolkata
    • https://cdn.sqhk.co/gitogozune/5iaehha/cartoon_tv_shows_on_netflix_for_adults.pdf
    • https://vokavubibobudew.weebly.com/uploads/1/3/5/3/135316357/rubaxagipuvapu.pdf
    • http://limuzinof.ru/18676515816pdjfg.pdf
    • http://meetlait.pro/votularuxebumodapakiwanol3f1x.pdf
    • https://cdn.sqhk.co/jugemito/jhiBGoe/jefofanoparupenaganumo.pdf
    • https://cdn.sqhk.co/navimoxa/jbhc1ii/invaders_from_mars_cast.pdf
    • https://cdn.sqhk.co/bipozipo/ibpUhhh/cold_war_beta_release_date_australia.pdf
    • https://cdn.sqhk.co/lobitukojuro/ilS2hes/ice_hockey_world_cup_2019_schedule.pdf
    • https://cdn.sqhk.co/xataruzepape/ggidify/nixiwosivubemojew.pdf
    • http://creamwalls.space/mapamundi_para_colorearwhmjn.pdf
    • https://jeletaru.weebly.com/uploads/1/3/5/3/135321400/e00b72cc56b9.pdf
    • https://tuwijojax.weebly.com/uploads/1/3/4/4/134477229/vobovif_jazunejurunibis_fijolaxuja.pdf
    • http://mignonette.space/zumunagakakegowanapav3vw8a.pdf
    • https://cdn.sqhk.co/melipetoluf/gj5gjaX/2d_shooter_sprites_free.pdf
    • http://airet.space/solidworks_tutorialslsabk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_980bc2164a774ce08d231163ea1b1bc3.pdf?index=true
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_213024bcbb4a45768e0cf37543b898f1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/67ae642c-2887-4b70-a80b-69561f918fa8/sawigi.pdf
    • https://uploads.strikinglycdn.com/files/d4203a45-04ef-4dba-ba9f-2bebbdb03041/woferevenikupat.pdf
    • https://9329dc78-1a6b-4cc7-98ac-1b36262b7dd5.filesusr.com/ugd/d2be55_9651dcf764084a9e8a5e2c833a32639a.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_off0000f011.bin
dd2fc392892962357b31279f8d688d0b8e374a09c1848dfe4867c304a7cff276		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF011 5284 bytes
font_01_sfnt_off00010203.bin
8968c07733a44b9229117de1d3c5ab8f6abddf41e07b938a7cb73f40f636b56a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10203 10888 bytes

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