Malicious PDF — malware analysis report

Static analysis result for SHA-256 66027aee9741a2f0…

MALICIOUS

PDF

97.0 KB Created: 2021-05-21 09:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 836b1d21f34611be994b7995e21a4a99 SHA-1: 955e80d696f125544934fec6c5e1ca93c98895aa SHA-256: 66027aee9741a2f07e039a5b7ff7c87efb2b4b02c4f1e853abb333f52c4ad7e4
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://xezojetit.ru/strik?utm_term=x96+max+smart+tv+box+%25284%252F32gb%2529 PDF link annotation
    • https://lakerevuko.weebly.com/uploads/1/3/4/6/134654656/ce745d080806d.pdfIn PDF document text
    • https://xoxilorimisutoz.weebly.com/uploads/1/3/4/7/134705863/1238291.pdfIn PDF document text
    • https://kasikijafeke.weebly.com/uploads/1/3/1/4/131406722/4a5ca3de04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365626/normal_6016d3608789a.pdfIn PDF document text
    • https://nodigikoj.weebly.com/uploads/1/3/4/3/134384892/7606891.pdfIn PDF document text
    • https://ziriponu.weebly.com/uploads/1/3/2/6/132696112/339f6e690006e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404105/normal_6062062645bac.pdfIn PDF document text
    • https://zizeximafebofiz.weebly.com/uploads/1/3/4/3/134369397/gulafusudajokep.pdfIn PDF document text
    • https://kuwujuzavasikit.weebly.com/uploads/1/3/5/9/135985591/geraxiwarekabub_pimamowonunu_zibamogunogone_limevinivovugav.pdfIn PDF document text
    • https://vobawele.weebly.com/uploads/1/3/5/3/135334277/1054fc8e81.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/98624eb5-dada-41e3-9deb-ce2f514065f8/garmin_forerunner_405_watch_band.pdfIn PDF document text
    • https://s3.amazonaws.com/nojemi/reported_speech_communicative_activities.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca328a29-06da-4cab-886c-2f95589a981b/69000621211.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/wowhead_balance_druid_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c14bbef0-c65e-4367-98af-50b0841521af/failure_to_record_accrued_interest_expense.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/nolametalevowafujilomevo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a58c2ba2-b86b-4480-a259-bdd4871729bf/kepedadilafufu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c37792c-dc89-4031-8805-037aaff7b1a0/69989775189.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/jidifojudidijitoxizagod.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/xikenalexupifixudijudon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ed40070-f8b3-4410-ba46-45179e6acb29/sebubuvu.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001205b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1205B 17064 bytes
SHA-256: 3b16dc06cf9b2195dd48e70ed54eedf9c18d5650f3b5a6cdcbd747804dd92e02
font_00_sfnt_off00010b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9C 6104 bytes
SHA-256: 4755524e5099e09aa3c002d460b55fa4aa5be1ab4504a19cc35546d510e4cb39
font_02_sfnt_off00014fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FA9 10332 bytes
SHA-256: ddb0531639e8f12ed3b8f5eb10f3bd418ff67d6da6b3e3532905c5bebd3be142