Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c34c86318b57ed0…

MALICIOUS

PDF

81.9 KB Created: 2021-04-10 01:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f3cdf72490ae2431a41109a1bfbca583 SHA-1: 2ee14cb7a6bca49c39eec8c8f8657171ddd6dcc3 SHA-256: 6c34c86318b57ed0660044ec8b3f8e5c553f76d6b31362ef6686bcce915ef29f
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are on disposable hosting and utilize UTM parameters, suggesting a phishing or link-farming scheme. The presence of external URI heuristics and the ML_NYX_PDF_MALICIOUS flag strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://zajinet.ru/strik?utm_term=what+is+the+molecular+weight+of+fusion+protein PDF link annotation
    • https://cdn.sqhk.co/tomubozes/gjCl9kE/gadivika.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505687/normal_5fcfafd4aeb1c.pdfIn PDF document text
    • http://trokot-newshop.online/cool_ringtones_for_android_2020156e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447640/normal_5fce6a3adb569.pdfIn PDF document text
    • https://cdn.sqhk.co/disarelas/jiv7jcW/jarepiz.pdfIn PDF document text
    • http://kmplitka.shop/503494440893bb38.pdfIn PDF document text
    • https://cdn.sqhk.co/dovawowo/kid5jee/helix_jump_ipad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466411/normal_6012ecf5628b7.pdfIn PDF document text
    • http://geleostone.online/girl_with_the_dragon_tattoo_trilogy_moviesy720q.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexofap/Jggihjr/download_winner_soccer_evolution_apk_mod_unlimited.pdfIn PDF document text
    • http://tradebot.space/what_is_network_operating_system_with_examplexz5gc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450140/normal_5ff1c24156554.pdfIn PDF document text
    • http://poopo.ru/how_to_program_homelink_garage_door_opener_porschezkqhs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384642/normal_6049f6c01e07f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392867/normal_6030363b6835b.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/Tg3jcia/62869294875.pdfIn PDF document text
    • http://thepropheticapp.com/57440813741dpyi1.pdfIn PDF document text
    • https://cdn.sqhk.co/kagalitisup/iegejh0/barbie_granny_v3_horror_escape_games.pdfIn PDF document text
    • https://cdn.sqhk.co/kuxaroposa/gebJ4vv/pemoviguvebazosut.pdfIn PDF document text
    • http://meetsoda.pro/19272698545zkq82.pdfIn PDF document text
    • https://cdn.sqhk.co/tobijoge/hCk13gj/virutibal.pdfIn PDF document text
    • http://worldworkbook.com/honeywell_6160_alarm_keypad_manual6w2qe.pdfIn PDF document text
    • https://cdn.sqhk.co/vipikunowi/lyjhike/ark_viking_bay_silica_pearls.pdfIn PDF document text
    • http://usacarins.com/tappan_oven_parts_diagramy99a4.pdfIn PDF document text
    • http://sollabs.xyz/the_grimm_troupe_guidefun4x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF585 2900 bytes
SHA-256: 40ce0bc9b113ef031639604f059b60aa9f1e41b097d60e75bfbf620cccc66306
font_01_sfnt_off0000ffc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC9 5532 bytes
SHA-256: a1a874dc7716d5b47f0925a4056d5a031e8a62f66da4dba477f2487f7f36c033
font_02_sfnt_off00011291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11291 11368 bytes
SHA-256: 45bd87a3523a1ad2e69ba4b919914dd019b67d557662fc1675a5088d563110e9