Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b7775a62de23999…

MALICIOUS

PDF

110.9 KB Created: 2021-03-25 03:56:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 74f5528ed7be1303bb05884a6504580a SHA-1: 5ae353ae1c6271036f50afcd2e7bb7405b14f454 SHA-256: 3b7775a62de23999a610f61144f97c42d8b1d769bd952557b81d7dd323707b84
126 Risk Score

Malware Insights

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

The PDF file contains a lure related to 'adolescent problems and their management' and embeds a URL pointing to a suspicious domain. Heuristics indicate it's a link farm on disposable hosting and ML classifiers and ClamAV have flagged it as malicious, specifically a phishing trojan. The embedded URL is the primary indicator of compromise, likely leading to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://midufefew.ru/award?keyword=adolescent+problems+and+their+management+pdf PDF link annotation
    • http://lebedugipul.mywebcommunity.org/how_to_set_a_timex_ironman.pdfIn PDF document text
    • http://detarekowopowub.22web.org/guided_meditation_sleep_love.pdfIn PDF document text
    • http://podarokinsta.online/how_to_find_velocity_calculatorcnw3q.pdfIn PDF document text
    • http://likedizar.medianewsonline.com/how_to_pair_ue_boom_2_speakers_together.pdfIn PDF document text
    • http://espaceabonne.com/barber_shop_logo_templateiwdnx.pdfIn PDF document text
    • http://benomudefosopux.iblogger.org/how_do_you_start_a_good_introduction_paragraph.pdfIn PDF document text
    • http://junijaseru.iblogger.org/how_to_replace_toner_on_samsung_xpress_m2880fw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_71f1622544e84981b4d63d4b6ad6fcee.pdf?index=trueIn PDF document text
    • https://b962d5b8-8819-42e3-9ba3-d95e8366760e.filesusr.com/ugd/f51585_05592fb8fe7c42c68c9d2cc97962cf17.pdf?index=trueIn PDF document text
    • http://povodakav.myartsonline.com/data_analysis_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c84ebd4a-68d4-4795-b4f5-642651c4587b/tokyo_ghoul_re_anime_review.pdfIn PDF document text
    • http://vozajaw.rf.gd/hadisa_afaan_oromoo.pdfIn PDF document text
    • https://86a6be6f-1c3f-48a2-98e5-8a654ddc1212.filesusr.com/ugd/027f51_39e69981c901472b9a8d3733e3956bb9.pdf?index=trueIn PDF document text
    • http://zadarubumu.rf.gd/93629852189.pdfIn PDF document text
    • https://30cc9e9c-6145-4029-bfdc-d0561bdb3a10.filesusr.com/ugd/0dcf4b_32869b47907249038566c96988509ca1.pdf?index=trueIn PDF document text
    • http://fekukifenakojuk.epizy.com/14559553641.pdfIn PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_bedefd48fbd0411ca16ef57385bb3f17.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/18d5d4e8-4400-497c-a862-c0062595806a/movogunovi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6f57073-1ce9-4d48-81bf-515a01da2b23/why_does_urine_smell_like_vinegar.pdfIn PDF document text
    • http://kuxagevoze.rf.gd/50438051987.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea26c3ed-5beb-4a57-8790-8eaffe8c9f44/zinanabedusisivuxulaj.pdfIn PDF document text
    • http://zasizuv.rf.gd/was_navy_seals_cancelled.pdfIn PDF document text
    • http://pimuxexud.epizy.com/florida_collections_textbook_10th_grade_answers.pdfIn PDF document text
    • http://gezexibubaju.rf.gd/how_much_are_the_baby_back_ribs_at_boston_market.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c83047d-9ce4-4517-9c4e-23d841ee12ff/which_cochlear_implant_is_best.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000165d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165D2 5488 bytes
SHA-256: 898d84e1839e9e4e77801fbcc7a22c224321f8fb00d9617f49842a3add6c32bb
font_01_sfnt_off00017847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17847 11488 bytes
SHA-256: 6ce8b6c34a5c98df4c65e0c44b86658db06d87404348bbfe0cf6501677ac3fbb
font_02_sfnt_off00019f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F0A 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c