Malicious PDF — malware analysis report

Static analysis result for SHA-256 239aa4254bcd33f9…

MALICIOUS

PDF

74.2 KB Created: 2021-05-05 19:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3b226827fd2903474f67f3de76b821e9 SHA-1: 23a663ebeaf93d37eb7ebe4b46d920c2b1213ffe SHA-256: 239aa4254bcd33f9c560f9b68025a1faab09d5905c6aebc8f5ffeb24d5e9828e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a secondary payload. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm tactic to obscure the true malicious destination.

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://bologen.ru/strik?utm_term=why+does+my+lg+washer+stink PDF link annotation
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://trastenmyqort.online/kenigobuwyyghz.pdfIn PDF document text
    • https://ginataxidorivez.weebly.com/uploads/1/3/4/0/134041929/9939448.pdfIn PDF document text
    • https://jinajifija.weebly.com/uploads/1/3/4/8/134889339/niged-zopap-bamebaki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393359/normal_5fe80f1630e9d.pdfIn PDF document text
    • http://vuxokiwi.22web.org/49934637247.pdfIn PDF document text
    • http://gisoboxizaza.mygamesonline.org/36792087767.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381287/normal_5fc660d3061e7.pdfIn PDF document text
    • http://organicnu.info/94198509536ef8jy.pdfIn PDF document text
    • http://vamoktin.ru/296357906htctx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nedenapurolaket.rf.gd/gc_university_faisalabad_bsc_date_sheet_2019.pdfIn PDF document text
    • http://wutorokanotomav.onlinewebshop.net/lobuporeforeki.pdfIn PDF document text
    • https://d73c234d-0e3d-497d-8108-d5659bace061.filesusr.com/ugd/58a813_b8b5df3ec3714a8d86ab410aca54a7b7.pdf?index=trueIn PDF document text
    • http://magetamuwunaze.rf.gd/livre_arboriculture_fruitire.pdfIn PDF document text
    • http://bejanifezilo.atwebpages.com/present_simple_very_easy_exercises.pdfIn PDF document text
    • https://d0fd22f1-78bd-4368-960d-2a324028b2bb.filesusr.com/ugd/a4d998_513059adf89a42fb99ebbdadbf1f8a14.pdf?index=trueIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_eb5e780ba64f46b4a940559e6b9f7013.pdf?index=trueIn PDF document text
    • http://kowelakava.rf.gd/running_calendar_template.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_off0000e4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C9 5508 bytes
SHA-256: 3f68c9559f6c7d87d7869588bc624e740404096b2ae34b727e243acdcd796680
font_01_sfnt_off0000f779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF779 10840 bytes
SHA-256: a792cf9ff371be29bfb24fa792e85d0d201e519f9f0a9f7f090019a7a9bba746

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