Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61bfb23d076a9ae…

MALICIOUS

PDF

78.7 KB Created: 2021-04-25 18:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 042428a8bd4530d5561b637298192a2b SHA-1: 292a559f730a30aa37712490ed21e64b1fe82db9 SHA-256: a61bfb23d076a9aebfc8ffad8618cc92f7cd43742b1d6e8f5fd2a9d1c9b712bf
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm used for distributing further malicious content. The document body, though heavily corrupted, appears to be a lure related to 'reading comprehension questions', likely to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://kuzutuzo.ru/strik?utm_term=the+end+of+overeating+reading+comprehension+questions PDF link annotation
    • http://elinekici.online/spanish_verb_list5i6yw.pdfIn PDF document text
    • http://familyit.info/837876749273juax.pdfIn PDF document text
    • http://urott-hu.com/meal_plan_template_doc978wz.pdfIn PDF document text
    • http://sdek-24.cc/966480065209wm9o.pdfIn PDF document text
    • http://geesecam.com/invisible_cities_italo_calvino_abebooks01jyr.pdfIn PDF document text
    • https://nozijuga.weebly.com/uploads/1/3/4/6/134698325/5567997.pdfIn PDF document text
    • http://sdek-24.cc/13083635262hwzro.pdfIn PDF document text
    • http://kuxni.su/sijuvoradulufujuzzi70.pdfIn PDF document text
    • http://bestcreditcheck.info/64476480635h2xem.pdfIn PDF document text
    • https://fiverepibimasi.weebly.com/uploads/1/3/4/8/134893498/cfde060605.pdfIn PDF document text
    • http://triple-doska5.club/strategy_training_courses_in_nigeria_for_20192v36u.pdfIn PDF document text
    • http://farvestnn.ru/2830375777217gwx.pdfIn PDF document text
    • http://supermagazforsale1.xyz/race_3d_apk_downloadulgfp.pdfIn PDF document text
    • http://healthytrands.com/breves_cuentos_hispanosrg9fn.pdfIn PDF document text
    • http://filanion.online/9716985661971rgf.pdfIn PDF document text
    • https://jitolubupiloz.weebly.com/uploads/1/3/4/6/134637312/jewikutilerex.pdfIn PDF document text
    • http://wowitaly.pro/leboxitugasovaxijejaji6qucq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sosagid.epizy.com/tifufegilipiribatosuvugik.pdfIn PDF document text
    • https://b2fc43c4-60ab-4dc1-a1c8-84833fda4e2a.filesusr.com/ugd/37321e_8698a9c9590c47c8bd2e1a534cc322e8.pdf?index=trueIn PDF document text
    • http://vobuxex.epizy.com/91239002677.pdfIn PDF document text
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_90fff359b9414f78aafb83bcc1e759ea.pdf?index=trueIn PDF document text
    • http://rusegidi.rf.gd/40021073025.pdfIn PDF document text
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_f9ea9ad3834f4f98a9ef839bcdfeb79e.pdf?index=trueIn PDF document text
    • http://pugavidugipiton.rf.gd/pipibixupibavanofebox.pdfIn PDF document text
    • https://b962d5b8-8819-42e3-9ba3-d95e8366760e.filesusr.com/ugd/f51585_ddaf5c643f82468a94d5c39b99a50a34.pdf?index=trueIn PDF document text
    • http://fefuxomag.rf.gd/big_data_architecture_framework.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_off0000f4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AA 5672 bytes
SHA-256: 9c1f57bddb11cf643ebf443320619a696ef8dc73ef6746eb81a38d59391492be
font_01_sfnt_off000107ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CE 10236 bytes
SHA-256: 68fbcadaed98a87ea019d69cc63aaebb1e07aea05926d742dc0d1b6a83a5a7fa

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