Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5fda84f55e8119…

MALICIOUS

PDF

71.7 KB Created: 2021-02-22 20:08:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 9e29937b65476d89cce5b3e80ad82b23 SHA-1: 5b3c57da1597743afee63556a69b39bf4dc3f1de SHA-256: 1a5fda84f55e81194ddb50ef23775915957493077c5c42bfa6b20bc23fe074f2
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a lure related to 'gas tankless water heater installation cost'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous links, suggesting a phishing or scam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=gas+tankless+water+heater+installation+cost PDF link annotation
    • http://alania365.ru/60452984270oj9r6.pdfIn PDF document text
    • http://pannochki-art.com/forensic_science_final_exam_questionswyxmv.pdfIn PDF document text
    • http://thedouche.xyz/fobafobubagiptdyl.pdfIn PDF document text
    • http://eagleaff.com/scada_supervisory_control_and_data_acquisition5g1c4.pdfIn PDF document text
    • http://zebrait.fun/icd_10_code_for_severe_sepsis_due_to_e_coli8a77n.pdfIn PDF document text
    • https://kererivodukeje.weebly.com/uploads/1/3/5/3/135303009/fd46b7909e3a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_600df72e1efcd.pdfIn PDF document text
    • http://aycotoro5.xyz/uc_browser_for_pcf8f12.pdfIn PDF document text
    • http://allfreebets.ru/xajujadigazolawomadubawuxhfmu.pdfIn PDF document text
    • http://milansit.space/game_genie_nes_classictz6sg.pdfIn PDF document text
    • http://fitnesspack.net/dragon_ball_super_manga_24ulxes.pdfIn PDF document text
    • https://nemabofafuz.weebly.com/uploads/1/3/5/3/135389169/famujunire.pdfIn PDF document text
    • http://salukapebuke.iblogger.org/63386357013.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497685/normal_5fd94bbdadd67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481273/normal_6024bc2e4388c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vaguxaza.epizy.com/94873480888.pdfIn PDF document text
    • http://niwuzowebod.epizy.com/bacterial_meningitis_guidelines_philippines.pdfIn PDF document text
    • http://sitotozip.rf.gd/60994846057.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_off0000dcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBB 5076 bytes
SHA-256: e5ad0f88e39e7d39cd72508aaa1e5fa1e32cb2794f389645eae786b8a88d3b8f
font_01_sfnt_off0000ee0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0D 10284 bytes
SHA-256: a83413cdaeabe5bd76f4f104624a07e9b83c807dc3689dff915372f8c52d613e

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