Malicious PDF — malware analysis report

Static analysis result for SHA-256 576353ca260a64e0…

MALICIOUS

PDF

89.1 KB Created: 2021-03-05 16:25:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c24d93d788679c2be17a729663a8a3bc SHA-1: 7f5793cf467ee618addc5b49948f1bfa1e949119 SHA-256: 576353ca260a64e00c4dc9f3c9bc4170c942e6dc5aafdac67595647bd6d78f90
134 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as a phishing trojan. It contains numerous external URLs, with one specifically identified as a redirector for a 'davis vantage vue console reset' query. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links pointing to disposable hosting, suggesting a phishing or spam campaign. The ML classifier also strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://baarspo.ru/strik?utm_term=davis+vantage+vue+console+reset PDF link annotation
    • http://remoliwagofaju.mywebcommunity.org/books_like_sharp_objects_gillian_flynn.pdfIn PDF document text
    • http://poopo.ru/the_exorcist_movie_on_netflix7y4zg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382629/normal_5fe51a71d071f.pdfIn PDF document text
    • http://labincom-med.ru/where_can_i_watch_dantes_inferno_animated_movieyvbgt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489994/normal_603ff678c901d.pdfIn PDF document text
    • http://merishwheelrecords.com/43296196755zmppp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375358/normal_602b8601caf8d.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/basic_math_word_problems_quiz.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/45976867550.pdfIn PDF document text
    • http://hallop.xyz/jikafiminomugycpus.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/why_is_my_fire_alarm_beeping_with_new_battery.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445745/normal_60273133c4ef8.pdfIn PDF document text
    • http://wexoxunesixu.iblogger.org/build_my_life_pat_barrett_chords_and_lyrics.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://newemepakirid.myartsonline.com/92969913084.pdfIn PDF document text
    • http://literukijo.epizy.com/is_speed_queen_washer_high_efficiency.pdfIn PDF document text
    • http://wumijitune.epizy.com/82744125152.pdfIn PDF document text
    • http://belajuba.epizy.com/matthew_henry_method_of_prayer.pdfIn PDF document text
    • http://gonapubofolok.epizy.com/lapulavemijukomolonimilux.pdfIn PDF document text
    • http://sedexajukewuxep.epizy.com/76647193895.pdfIn PDF document text
    • http://vebavibokifoko.epizy.com/annamalai_song_free_starmusiq.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_off0001220b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220B 5024 bytes
SHA-256: 74134c1cd4580213c7897810fee86df58f7719790120119da567644969f7f033
font_01_sfnt_off00013342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13342 10592 bytes
SHA-256: 5c25925b1ffb6b9343d4e0cceff22ef36153a3660686a03f26bb6f142351eab8

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