Malicious PDF — malware analysis report

Static analysis result for SHA-256 da97bf07de681f8f…

MALICIOUS

PDF

82.5 KB Created: 2021-03-10 15:28:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: f72a4ad59164ca758bac2c9c9cbd7693 SHA-1: 5538ed808c1d6f3db62911cffd0e5c0fa0ca9cb9 SHA-256: da97bf07de681f8f97f46425cf5ab250d005413e98c603e985ac3c6e40521169
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains numerous external URIs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the heuristic indicating a link farm on disposable hosting strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=5g+male+enhancement+review PDF link annotation
    • http://popularchoice.space/bifirapodbk2tf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464861/normal_602245e1b7025.pdfIn PDF document text
    • https://kukanoli.weebly.com/uploads/1/3/4/6/134641169/nujasimujebewuwofewe.pdfIn PDF document text
    • http://mogitumo.iblogger.org/46899275079.pdfIn PDF document text
    • https://warevinigipa.weebly.com/uploads/1/3/4/8/134898994/tileguxaduvuf-jiletefufegonut-guvalev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380382/normal_603682c9f0ccc.pdfIn PDF document text
    • http://fabermanufacture.ru/anderson_multivariate_statistical_analysiso67sk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376612/normal_604760ab0b27e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445880/normal_6040e7dc19569.pdfIn PDF document text
    • https://dorikorojuj.weebly.com/uploads/1/3/3/9/133987202/gunojajepozusumavexi.pdfIn PDF document text
    • http://circleshtang.xyz/como_crear_un_archivo_con_imagenes_escaneadas0dg9z.pdfIn PDF document text
    • https://sazojowob.weebly.com/uploads/1/3/4/3/134351878/2402282.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372723/normal_5fedad465c0c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455375/normal_604671ba2da4e.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/sulasatevirexo/java_1._7._0_79.pdfIn PDF document text
    • http://nirozat.rf.gd/other_blood_groups.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/sopod.pdfIn PDF document text
    • http://sodidoxab.rf.gd/madekap.pdfIn PDF document text
    • http://zerakunutage.epizy.com/dell_precision_3630_tower_spec_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/dell_optiplex_790_dt_review.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/android_studio_upgrade_api_level.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_off000108bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BF 5216 bytes
SHA-256: 0830e36978357d2a518f7f4029dccadf3038f96ec7db59069207cd45208814ba
font_01_sfnt_off00011a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A63 9992 bytes
SHA-256: 13cebc5c2e13773b1c5f77ee93e0a4d6a2bd3973733191b7e0825a147d4ff234

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