Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb8b5266420d9e29…

MALICIOUS

PDF

99.4 KB Created: 2021-03-28 14:40:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d366668d3f0040cb62eea43a3a9085c3 SHA-1: 6d354146f9e854e4c57e3194c7b5045cf00fb1e9 SHA-256: bb8b5266420d9e292d1250d9206e5fdefdf1d090b7fa17a4fcc5d15f80c1d890
156 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of external links, flagged by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV also identified this file as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the nature of the link farm suggests an attempt to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=the+concept+conspicuous+consumption+refers+to
    • http://tuzupibu.scienceontheweb.net/dibifudemekiremat.pdf
    • http://tevaruv.sportsontheweb.net/verbal_analogies_test.pdf
    • https://tujalulu.weebly.com/uploads/1/3/4/3/134382228/825965.pdf
    • https://cdn.sqhk.co/jogowijalaro/nWv5P4j/anita_anita_telugu_song_free.pdf
    • https://cdn.sqhk.co/desogepupema/Oge6HF2/air_elite_private_jet.pdf
    • https://cdn.sqhk.co/junigofulum/2gf6KTP/youtube_mp3_player_online_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4375341/normal_60167f6bc3990.pdf
    • https://cdn-cms.f-static.net/uploads/4465151/normal_603fcedcb7389.pdf
    • https://cdn.sqhk.co/vazedibimi/xjau9hi/foosball_balls_for_sale_near_me.pdf
    • https://cdn.sqhk.co/bitaxukezor/PNXjgif/signal_private_messenger_free_download.pdf
    • https://duzesoduvumasu.weebly.com/uploads/1/3/4/1/134131570/137d2edc22d16.pdf
    • https://furifusopuwebe.weebly.com/uploads/1/3/4/4/134471692/zoxaruzil.pdf
    • https://gogozofoful.weebly.com/uploads/1/3/4/5/134512065/xibaxupax.pdf
    • https://cdn.sqhk.co/fuwunikuneg/jjhiahc/magical_fairy_live_wallpaper_android.pdf
    • https://cdn.sqhk.co/nejisakatok/jbKN86n/speed_racing_ultimate_3_apk_uptodown.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jeragapa.epizy.com/antenna_theory_tutorialspoint.pdf
    • http://lawodedizijipem.epizy.com/giweruwesijimojisisane.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014654.bin
b8029172b302a29db6ad9ab4e123c7c7d9f1c3cb1647e9c9861643cbc59ba597
pdf-font-stream PDF embedded font (sfnt) at offset 0x14654 4960 bytes
font_01_sfnt_off0001570d.bin
c31c57e441318142ed3453da2493f03e5ddd1110c08ac4eb5345218abb701f4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1570D 12312 bytes