Malicious PDF — malware analysis report

Static analysis result for SHA-256 575ad95afe657e77…

MALICIOUS

PDF

157.6 KB Created: 2021-03-15 00:16:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 75585be409e0679d112a8fca2712cfc9 SHA-1: ae8e45ceb1045aec227505b988e8d96a533bde22 SHA-256: 575ad95afe657e7729bb7ecdc0e6938f55b4ff3a1058662c809663a4917dbe33
146 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, and exhibits characteristics of a phishing lure. The document body, though heavily obfuscated, suggests a deceptive context related to training manuals. The presence of numerous external URLs, including one hosted on disposable infrastructure, indicates an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF format can embed JavaScript, which is often used for malicious redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://vilenefex.ru/123?utm_term=aquaponics+training+manual+pdf PDF link annotation
    • https://vemenujobife.weebly.com/uploads/1/3/5/3/135399872/riletuvuditazade.pdfIn PDF document text
    • http://trylait.club/jewiwimuxisifutagikuwskn3v.pdfIn PDF document text
    • http://nebo-baikala.ru/842919119075xynx.pdfIn PDF document text
    • http://instasale.company/jeu_avec_32_cartes_a_2czlmv.pdfIn PDF document text
    • http://gvidilon.ru/pufibajeweduxudivujanigpl3w9.pdfIn PDF document text
    • http://fito4ka.xyz/lista_de_verbos_en_ingles_regulares_e_irregulares_mas_comunes9c38q.pdfIn PDF document text
    • http://shopsmmv.site/falejikembxtnk.pdfIn PDF document text
    • http://creditscoreusa.info/95869387444yliav.pdfIn PDF document text
    • https://borusolu.weebly.com/uploads/1/3/4/3/134327960/5519739.pdfIn PDF document text
    • http://skidki-day.store/jilaloligijexipamibbu6pu.pdfIn PDF document text
    • https://koverirenupoma.weebly.com/uploads/1/3/4/7/134747520/kidoginenov_jediruvud_peguleziza_bijupirixir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xokirik.epizy.com/tokubosobamuminixewusemox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8539d97-80f9-4d96-9357-83593b65720c/is_shadow_and_bone_a_romance.pdfIn PDF document text
    • http://deravamosu.rf.gd/av_malformation_brain_treatment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2681fb7-fd91-4b0f-8804-15ce33eb4993/2005_nissan_sentra_service_engine_soon_light.pdfIn PDF document text
    • http://lamezidame.rf.gd/how_to_transition_graco_car_seat_into_booster.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fee38a1-1320-4cdf-885a-663d9c9d02c6/how_to_cook_brown_rice_in_tiger_rice_cooker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad227c05-64e2-4af8-bd8b-79e5d06389d4/remove_icloud_activation_lock_without_password_apple_watch.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00021296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21296 5588 bytes
SHA-256: 7a4236cc08c0e66b46ede2b5a3bb88544218354524b4ba0c55884d558f453699
font_01_sfnt_off0002257a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2257A 13072 bytes
SHA-256: 78bc003fec378070ebf69678f6e22c248b80460754eced1e5135d36175889fca
font_02_sfnt_off000250fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x250FD 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e