Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b170d55b314eb1f…

MALICIOUS

PDF

98.1 KB Created: 2021-04-21 23:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 467569e39b2a602e6aee1cec7cffdd2a SHA-1: 7aad39a03465ad27842fda745fb016028be623ed SHA-256: 4b170d55b314eb1f8fa3ec07f9d6bf78dd31387a5aaaa0d18dabef22863176cc
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is designed to redirect users to potentially malicious websites. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure strongly implies a link farm attack.

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://pelibifir.ru/strik?utm_term=longest+paper+written+in+one+night
    • https://cdn.sqhk.co/xaxovowupofa/Pepjajg/line_puzzle_color_string_art_mod_apk.pdf
    • http://chestlune.online/36521714067emmf5.pdf
    • https://cdn.sqhk.co/lezubenewago/Bpldaje/racer_vs_police_game_download.pdf
    • http://citrus-fruit.space/route_50_maryland_traffic_reportr0apv.pdf
    • https://cdn.sqhk.co/widafopaj/zjyjgqD/snapchat_icon_aesthetic_pastel_blue.pdf
    • https://cdn-cms.f-static.net/uploads/4447084/normal_6013ebee43b2c.pdf
    • https://cdn.sqhk.co/wanazofemuvu/iaHDbig/siwodopag.pdf
    • https://static.s123-cdn-static.com/uploads/4408340/normal_5ffa9ff759f70.pdf
    • https://cdn.sqhk.co/lewoxiguj/fjjiajc/random_character_generator_with_picture.pdf
    • https://cdn.sqhk.co/nudizodi/VWjajgK/zombie_exodus_dead_zone_release_date.pdf
    • http://about-central.com/75313527200lulb7.pdf
    • http://goloszauniver.fun/wedulefimomemabah2iy6.pdf
    • https://cdn.sqhk.co/ripigopes/e2hbVd8/ausable_river_fishing_report.pdf
    • https://cdn.sqhk.co/xinosemu/wgijixF/ice_cream_truck_delivery_toronto.pdf
    • https://cdn.sqhk.co/batitiviz/gjbQFnO/3683776258.pdf
    • https://cdn.sqhk.co/maxegugej/jgn9ij9/juega_football_legends_2016_en_linea_y8._com.pdf
    • https://cdn.sqhk.co/zogobadakedu/iCiaXQB/4853290027.pdf
    • https://cdn.sqhk.co/pasojixaju/WjghjES/71135921458.pdf
    • https://cdn-cms.f-static.net/uploads/4455657/normal_60600f28ce4bb.pdf
    • https://cdn.sqhk.co/numovasovev/guidigs/62377145252.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_55d492d94b4547e381302fd0edd68bf4.pdf?index=true
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_66de101132714ce6bcb8fc8c3800a91e.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_off00014011.bin
37d8e6489f21180a1612ddcdfe522fbd6ddfdec02176992964cb348c02d36ac6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14011 5080 bytes
font_01_sfnt_off0001516f.bin
41a32b29b55a4e454bfc0aac61fe55da5fac4e3b0defcdb859247f3bd9fee45b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1516F 12948 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.