Malicious PDF — malware analysis report

Static analysis result for SHA-256 c661cf902252f614…

MALICIOUS

PDF

170.0 KB Created: 2021-03-17 13:21:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7d192f09abe4e5823e65356fc9a2d9bb SHA-1: caffc6badc6b81c0f8f665bfa500a9334d317b08 SHA-256: c661cf902252f6145b1b5963e382692bf6551d0f1963ea3afa8854b00b042ec7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan distribution. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a strong intent to redirect users to malicious sites. The document body, though heavily obfuscated, suggests a lure related to 'Maplestory maple mania guide', likely a pretext to encourage clicks on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://jottigo.ru/123?utm_term=maplestory+maple+mania+guide PDF link annotation
    • http://namafafiteg.mypressonline.com/36032123919.pdfIn PDF document text
    • https://gekuraneg.weebly.com/uploads/1/3/1/6/131637503/litujisiv_duxitudojaduvip_jirutojuwemorul.pdfIn PDF document text
    • https://bigimenuxorotel.weebly.com/uploads/1/3/4/6/134655509/02a1a.pdfIn PDF document text
    • http://electorat.org/is_dominos_pepperoni_halal_in_canadab0i1a.pdfIn PDF document text
    • http://letnesil.xyz/30890256203tnw66.pdfIn PDF document text
    • http://naturagrush.space/popexupanetupugasagyvcdo.pdfIn PDF document text
    • http://norasidifonilov.22web.org/books_about_vietnam_war.pdfIn PDF document text
    • https://bikugepoxo.weebly.com/uploads/1/3/5/3/135351236/8028082.pdfIn PDF document text
    • http://indonesia2health.online/bluestacks_offline_installer_zipck9e6.pdfIn PDF document text
    • https://xonujofepip.weebly.com/uploads/1/3/4/3/134385468/4397759.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368777/normal_600dabbc2966c.pdfIn PDF document text
    • https://jevezorubik.weebly.com/uploads/1/3/4/8/134864628/xegodujanikid.pdfIn PDF document text
    • http://topukovatawosu.sportsontheweb.net/fleet_and_marine_corps_health_risk_assessment.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392220/normal_602300fa63f58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483602/normal_5fd661976a6c1.pdfIn PDF document text
    • https://vulesavub.weebly.com/uploads/1/3/6/0/136095957/vufokazasuzewub.pdfIn PDF document text
    • http://kifejuja.medianewsonline.com/22072971652.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417306/normal_6010ae82b74a2.pdfIn PDF document text
    • https://pafekirikigu.weebly.com/uploads/1/3/4/5/134590200/dezalasuxigo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mazolofoju.epizy.com/24686056502.pdfIn PDF document text
    • http://vedujekobizu.rf.gd/feralekip.pdfIn PDF document text
    • http://bopewexe.onlinewebshop.net/dovemawuloka.pdfIn PDF document text
    • http://putiremupupunis.epizy.com/58241579855.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_off00026153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26153 5384 bytes
SHA-256: 4924234fa041f5cebf412664545d23a7731e8ca0f0f86a3256876f3fc80e8345
font_01_sfnt_off0002739e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2739E 11128 bytes
SHA-256: 007cb99b32279f1a4315d775040c9ca49ef3c70408e9cf9c2a113820f5062b15

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