Malicious PDF — malware analysis report

Static analysis result for SHA-256 c04174448679a79e…

MALICIOUS

PDF

67.9 KB Created: 2021-04-08 02:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 05966340e84e080f46ffaf25d87ebfc0 SHA-1: 6f68495902e6fff877017ebe90fdd8f3b900b92d SHA-256: c04174448679a79e8f3577fba7586b9e4536d17121cc1a8d7837e322e83d4281
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one specifically pointing to a URL that appears to be a keyword-based redirector for 'chemistry workbook answers pdf'. This suggests a phishing or malware distribution lure, attempting to disguise malicious links within seemingly legitimate content. No scripts were extracted, but the presence of multiple disposable domains and link farms points to a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/wb?keyword=chemistry%20workbook%20answers%20pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406208/normal_6033de23c04c7.pdfIn PDF document text
    • https://cdn.sqhk.co/zuronenom/idUggii/jisivinewanitorepobot.pdfIn PDF document text
    • https://bururinuriz.weebly.com/uploads/1/3/4/8/134882015/jibegowoma.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/iNidieL/different_notification_sounds_for_different_apps_s20.pdfIn PDF document text
    • https://kunubukom.weebly.com/uploads/1/3/4/5/134599245/610996a.pdfIn PDF document text
    • https://vajepagipe.weebly.com/uploads/1/3/4/0/134000011/5206379.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490001/normal_600bfd002eead.pdfIn PDF document text
    • http://jijimaxugixu.22web.org/tefututulevi.pdfIn PDF document text
    • https://gitiritibew.weebly.com/uploads/1/3/1/4/131483488/7849371.pdfIn PDF document text
    • https://cdn.sqhk.co/jofijoju/jiy5RoT/67427327145.pdfIn PDF document text
    • http://zirosax.iblogger.org/36930892599.pdfIn PDF document text
    • https://cdn.sqhk.co/wexufenu/Fjfgi94/i_m_touching_base_with_you.pdfIn PDF document text
    • http://revadadijavu.22web.org/bewitched_bothered_and_bewildered_piano_sheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zofopopisi.rf.gd/41994634753.pdfIn PDF document text
    • http://zunedolu.rf.gd/jajuwofibizinivesota.pdfIn PDF document text
    • http://kifinuneniw.rf.gd/82902451363.pdfIn PDF document text
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_60ee892e841f430e8edef7d4ac23b66d.pdf?index=trueIn PDF document text
    • http://kagiwabiluwotel.epizy.com/5496380153.pdfIn PDF document text
    • https://2863666b-9d79-467d-9aad-9eeb6dafbdf2.filesusr.com/ugd/6ee3eb_40458772bef643958a342cc1b7b7ee7b.pdf?index=trueIn PDF document text
    • http://xupezewusipoja.rf.gd/mezomozagarefurexot.pdfIn PDF document text
    • http://sadamenukovizep.epizy.com/one_night_at_the_call_centre_summary.pdfIn PDF document text
    • https://2a082fd4-e93f-4b8e-9e59-408fa046b31c.filesusr.com/ugd/e334dd_5f5c4c833399431aa76f9409ceb7dfc7.pdf?index=trueIn 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_off0000cded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDED 5552 bytes
SHA-256: 236715d7df5584dea6c0c2143ff778baff50fc36cf8178e70be217c9ff4878ec
font_01_sfnt_off0000e0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B0 9872 bytes
SHA-256: 85b87856c625493358b4a271af5f474267e117d0cbfae1d80bee1d37dd5a70da

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