Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbad319bb14a0608…

MALICIOUS

PDF

86.7 KB Created: 2021-02-24 11:51:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: adf8380ec5dee8f9792ca859428749db SHA-1: 208ac7cb1b278e3da634c9dd15f27331c3088add SHA-256: cbad319bb14a06086d3dd997077848fe814b51a19b3353d6f68be9ebf459dc0d
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or redirectors, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains references to external URIs and appears to be part of a larger scheme to direct users to potentially harmful content.

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://druttle.ru/strik?utm_term=what+causes+a+burning+skin+sensation PDF link annotation
    • http://wellwork.site/pollo_loco_double_chicken_tostada_salad_calorieslktty.pdfIn PDF document text
    • http://tameenegypt.com/how_to_use_smart_board_for_online_teachingub6in.pdfIn PDF document text
    • http://meletemobu.iblogger.org/isaimini_tamil_horror_movies_2019.pdfIn PDF document text
    • http://wekabamile.22web.org/conservation_of_biodiversity_ppt_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411681/normal_602de64e14267.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383916/normal_5fe7714bdcad1.pdfIn PDF document text
    • http://f13x.xyz/julafirenukifuxivupopelun3lemd.pdfIn PDF document text
    • http://wusodopepufex.66ghz.com/is_the_collector_evil_marvel.pdfIn PDF document text
    • http://retys.fun/147230342081vnjx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370304/normal_6032f593a6128.pdfIn PDF document text
    • http://vizimuvorogo.22web.org/arduino_libro_de_proyectos_espaol.pdfIn PDF document text
    • http://rajedat.iblogger.org/canon_ip1800_mac_driver.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.website/7629078402318auu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fukorow.epizy.com/fasitemozogipab.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/15822272385.pdfIn PDF document text
    • http://xubaforan.epizy.com/aunty_number_1_govinda_movie.pdfIn PDF document text
    • http://zububewe.rf.gd/lurivewajexokafe.pdfIn PDF document text
    • http://jinadaxekuxawu.rf.gd/kozuxife.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_off000115aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AA 5248 bytes
SHA-256: db554409891473105e52d38c010cfc760af58269d07128b5dd56dac5f966e6a8
font_01_sfnt_off0001278a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278A 11248 bytes
SHA-256: 61b48933f54edefa92351b47a260518f522b18a2855377b8a41f49c1776ec8e7

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