Malicious PDF — malware analysis report

Static analysis result for SHA-256 0013afd6674ccdee…

MALICIOUS

PDF

80.2 KB Created: 2021-03-24 23:42:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0df2c4d379d6a56db72806db24a86b16 SHA-1: 7943a438c881e9faf49227fe7a140838f48da4d1 SHA-256: 0013afd6674ccdeebcf186ef11d18efc7f108823906a43c8dbfad929c3152d2d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The heuristic 'SE_DOWNLOAD_BUTTON' further suggests a lure to trick users into downloading something. The primary attack pattern involves exploiting user trust by presenting a seemingly legitimate document to encourage clicks on malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/award?keyword=jee+main+b.+arch+syllabus+pdf PDF link annotation
    • https://cdn.sqhk.co/nosimasiv/HtVPjbV/smart_manager_di_android_samsung.pdfIn PDF document text
    • https://cdn.sqhk.co/datimemovuko/iAFhhhi/371227599.pdfIn PDF document text
    • https://cdn.sqhk.co/mutuwatu/Ngegg1B/20304256876.pdfIn PDF document text
    • http://xokubenafap.66ghz.com/44182145859.pdfIn PDF document text
    • https://fufifodex.weebly.com/uploads/1/3/2/8/132814348/8d0f3182250f4a.pdfIn PDF document text
    • https://migixemigesafo.weebly.com/uploads/1/3/1/3/131381985/moruzodifi_botitevugukaf_wakuwilu_zimaxexepu.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/ge71Vhb/dasakagoneboxejuza.pdfIn PDF document text
    • https://cdn.sqhk.co/patizuruf/ghhZ74n/gas_prices_at_costco_oshawa.pdfIn PDF document text
    • https://nezuwiwobitedut.weebly.com/uploads/1/3/4/6/134600585/vitigisaramuper-purosemalamelav.pdfIn PDF document text
    • https://cdn.sqhk.co/sopiloroda/ciid5gc/residential_electrical_wiring_diagram_software.pdfIn PDF document text
    • https://mulononar.weebly.com/uploads/1/3/5/9/135959518/kujovezaxewuzudamadi.pdfIn PDF document text
    • https://cdn.sqhk.co/nipigagavadu/ezqheJc/extinction_psychology_example.pdfIn PDF document text
    • https://cdn.sqhk.co/tasaxasup/iaI9mhi/54387918723.pdfIn PDF document text
    • http://gozaped.iblogger.org/tactics_ogre_let_us_cling_together_romance.pdfIn PDF document text
    • https://lapokatodulobak.weebly.com/uploads/1/3/5/3/135347459/tejadizufisadazok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jixetumoxefa.epizy.com/accounting_and_finance_an_introduction_mclaney.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/noribaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70c5cf29-4491-44a4-bb4e-6aab014e8500/minijebunokikaganob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7488a77-89c7-4d9f-a1d2-4b5b54a09c74/pisadux.pdfIn PDF document text
    • http://zonatenitisa.rf.gd/15985841051.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/larifaju.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0B 5352 bytes
SHA-256: 6ece1999cf4e1f6a11af7caf7230a4bef5d72e0be40ff5a5bafd8aa52f7d58de
font_01_sfnt_off000100fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FC 10716 bytes
SHA-256: b34d2ad23132f9765dc093ead8bda43bb4ec6919492e7a15ece47c2b8e9dc540
font_02_sfnt_off00012596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12596 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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