Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d89789b3c70e848…

MALICIOUS

PDF

78.2 KB Created: 2021-03-15 19:01:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 613d70cf5efea9b05561e1fda9518c53 SHA-1: eac761db85a920c4ce96f6ed5f92ae7eb7ad73ce SHA-256: 1d89789b3c70e8483b82ca43b32c95325df54ec269e0f3da6464f375f5b7c9bc
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, 'midufefew.ru', which is likely used to host a malicious payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to 'lock and key cat porter pdf'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/wix?keyword=lock+and+key+cat+porter+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367304/normal_603edcf6113f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366048/normal_60067f98db7e2.pdfIn PDF document text
    • https://xolesozetenosox.weebly.com/uploads/1/3/1/0/131070434/vurut.pdfIn PDF document text
    • https://rusiwenul.weebly.com/uploads/1/3/5/3/135327855/redut_rurabokemab_zabod_sizakepifasez.pdfIn PDF document text
    • https://lawoxotat.weebly.com/uploads/1/3/4/5/134587222/5106783.pdfIn PDF document text
    • http://dibubewivutuva.22web.org/hisense_h50be7000_review.pdfIn PDF document text
    • http://wokelegekak.66ghz.com/27350078564.pdfIn PDF document text
    • http://retesopi.iblogger.org/american_pie_1-_8.pdfIn PDF document text
    • http://deworul.22web.org/kereb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452377/normal_5fe1412392553.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370530/normal_5ff54afa236b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413573/normal_5ff5be91c2dfb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/14884c27-93c3-4431-8d99-bbd53452c8f0/dimosakegopabufubuvagabig.pdfIn PDF document text
    • http://bilovero.rf.gd/nufisemunezosofe.pdfIn PDF document text
    • http://pulejebolev.rf.gd/lukolinigepanamalibubipa.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/68527475055.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/calendario_fiestas_patronales_en_puerto_rico_2019.pdfIn PDF document text
    • http://nedupidanasadef.rf.gd/porixefabonisokeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/697e558d-72e7-479d-8de4-c659ffbe8a58/laserjet_m1217nfw_mfp_toner.pdfIn PDF document text
    • http://vafidufetavum.epizy.com/canon_rebel_t5_battery_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/620b3600-5c76-4b8c-9543-e46f96caaa87/anna_kendrick_scrappy_little_nobody_quotes.pdfIn PDF document text
    • http://fejukuvazov.rf.gd/alliteration_practice_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/casos_de_uso_ejemplos.pdfIn PDF document text
    • http://gofekujapi.rf.gd/what_is_bowl_lift_on_a_kitchenaid_mixer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9daf79b4-2517-4a22-812a-925d1af7b9f6/el_pollo_loco_500_calorie_menu.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/what_are_the_main_objectives_of_planning_an_auditing_internal_control.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF274 5048 bytes
SHA-256: f72cf253f47171a81c7b009097ffc0844d4fe77ba7c884d9f1e8225d85a07668
font_01_sfnt_off000103ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CA 11436 bytes
SHA-256: 9eda9228b3586c4ca34cf263ccdd8f3fb10b0ea356bf4bfd86b3500a6198116b