Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd1c0875069e154…

MALICIOUS

PDF

74.0 KB Created: 2021-03-30 21:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 842707aa0fb3cfde2b17fe95b71e8b4b SHA-1: a5633f2b5b15f7c3e51548a761af7284620db1b3 SHA-256: 7fd1c0875069e154c04d13d3963b84124150f9b1fba2218c42891b7bb6a9d4f3
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, many of which are disguised as legitimate downloads or search results for popular media. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a link farm or redirection mechanism to ultimately deliver a malicious payload.

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=rod+stewart+the+great+american+songbook+volume+5
    • https://cdn.sqhk.co/remonupode/ZpBghoZ/88375257015.pdf
    • https://linazoforup.weebly.com/uploads/1/3/0/8/130814758/jabemexoxog.pdf
    • https://static.s123-cdn-static.com/uploads/4365639/normal_60021d87e787b.pdf
    • https://cdn.sqhk.co/momujolo/ObGegdT/jobmania_eternal_dungeon_redeem_code.pdf
    • https://cdn-cms.f-static.net/uploads/4443578/normal_602df376ec76b.pdf
    • https://cdn.sqhk.co/sidamebo/hihdhhh/niwata.pdf
    • http://pojebanidik.mywebcommunity.org/ncert_science_class_10.pdf
    • https://cdn.sqhk.co/ruxuzobisu/ibghigc/labogudanaxuzojupuj.pdf
    • http://fituxem.sportsontheweb.net/cattle_production_in_ethiopia.pdf
    • https://vajojesorenum.weebly.com/uploads/1/3/0/9/130969616/3765892.pdf
    • https://cdn.sqhk.co/gopuxipo/yOjejbP/vintage_telephone_ringtone_download.pdf
    • https://cdn.sqhk.co/bitizulokiva/tlf4hjf/browser_mining_free_bitcoin.pdf
    • https://cdn.sqhk.co/letarezetap/CsaOhdD/77800013952.pdf
    • https://cdn.sqhk.co/futidiwe/DPNSgiM/noxomifezepu.pdf
    • http://xegazinijitup.mywebcommunity.org/how_to_replace_ge_over_the_range_microwave.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sasitegeke.epizy.com/aladdin_2019_song_pagalworld.pdf
    • http://gulagopafed.onlinewebshop.net/story_of_my_life_piano_guys_sheet_music.pdf
    • http://ganusigesu.rf.gd/24811172417.pdf
    • http://fakadigat.epizy.com/asus_m5a97_le_r2_0_bios_update.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_off0000e199.bin
3e63a16721e0d63f2b81676e14bac2eb12f97c239af206b12a295dcc154d1acc
pdf-font-stream PDF embedded font (sfnt) at offset 0xE199 5840 bytes
font_01_sfnt_off0000f575.bin
5072db31779782a1048ddc7b53b03d805a04eb8b0d22018c094bb993bd32086d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF575 11288 bytes