Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2331aac679c1c06…

MALICIOUS

PDF

70.5 KB Created: 2021-02-09 21:34:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e45042c3184d060e30771427185fe7f7 SHA-1: db08e699e8e00b59416ba015c78a3c68d00af7bd SHA-256: d2331aac679c1c06eeb183e9377c3b6ceb6614f699553fca5fe970ff428d398f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal Application Data T1059.007 JavaScript

The PDF document exhibits characteristics of a credential phishing lure, specifically targeting multi-factor authentication or one-time code harvesting. The presence of numerous external URLs, many hosted on disposable domains or link farms, suggests an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to steal user credentials or session tokens.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://maypoin.ru/aws?utm_term=actus+performance+login PDF link annotation
    • https://petizigosi.weebly.com/uploads/1/3/4/9/134903326/4572761.pdfIn PDF document text
    • https://cdn.sqhk.co/womilepeba/cYjgijY/15913247326.pdfIn PDF document text
    • http://firstdoctor.xyz/super_mario_ds_world_2-_5_star_coinsynrkw.pdfIn PDF document text
    • https://zalevetupuxigex.weebly.com/uploads/1/3/0/7/130739655/mufifagodulifo-xosopa-fogonalubudito.pdfIn PDF document text
    • http://opsnatur.fun/ezi_wire_windscreen_removalp8o74.pdfIn PDF document text
    • https://murafasonuralab.weebly.com/uploads/1/3/5/3/135398902/7580052.pdfIn PDF document text
    • https://cdn.sqhk.co/powirafawume/f2jeiit/57520389659.pdfIn PDF document text
    • http://italystore.pro/labewinizojimiapg6l.pdfIn PDF document text
    • http://prizinsta24.site/on_my_own_song_ashes_remain0ggwj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470835/normal_5fc92db4578bb.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/jcUhdfp/fr_legends_update_2019.pdfIn PDF document text
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/ec06ce88.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/fountas_and_pinnell_guided_reading_levels.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/frontier_airlines_baggage_fee_information.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_off0000d517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD517 5324 bytes
SHA-256: f17afbd9799425c20c7caf404322f76c656ed2f180c21ad81d0ec6a97c337912
font_01_sfnt_off0000e71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71B 11152 bytes
SHA-256: 364bff01b513cd189a45187c0b1e24f3576efed30490fe97d9b6079b669e32fb

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