Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e110be407fb2eb5…

MALICIOUS

PDF

73.6 KB Created: 2021-03-22 07:21:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: cf08efd0934d21313aa2f62c0b9dfa03 SHA-1: 46b980d4cb2b3333c79b9c0fd586fece6937b3d3 SHA-256: 6e110be407fb2eb5135e3475b694966630b63872b4351bfb040eb6e496486a20
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 0.9997

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://golowaki.ru/123?utm_term=1+megohm+resistor+datasheet PDF link annotation
    • https://sowofofum.weebly.com/uploads/1/3/2/8/132814146/vezefijoju.pdfIn PDF document text
    • https://gadufekovofu.weebly.com/uploads/1/3/4/7/134764592/jemuroxokibo.pdfIn PDF document text
    • http://nakalabaxis.mywebcommunity.org/forrest_mims_555.pdfIn PDF document text
    • https://sanijala.weebly.com/uploads/1/3/4/8/134889677/mepigad.pdfIn PDF document text
    • https://botamelojobowi.weebly.com/uploads/1/3/5/3/135344227/5518929.pdfIn PDF document text
    • http://gepokupaburorew.mywebcommunity.org/antimodernidad_y_trabajo_social.pdfIn PDF document text
    • https://vozosirebuvova.weebly.com/uploads/1/3/1/3/131382942/dizubaselobopi_kuposuzinir.pdfIn PDF document text
    • https://rotugufe.weebly.com/uploads/1/3/5/3/135315725/7153664.pdfIn PDF document text
    • https://guxesawaxogego.weebly.com/uploads/1/3/4/3/134314991/bopovoxe.pdfIn PDF document text
    • https://finamiwowekizo.weebly.com/uploads/1/3/2/3/132302732/gaxajovip_zowajupireri_mikolebitakumo.pdfIn PDF document text
    • https://giwelexe.weebly.com/uploads/1/3/0/8/130814055/kamijijugijaxedob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wujodibu/repan.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/wavavagofarigojideto.pdfIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_2fca797d08104078ad8244106e4ef760.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/buvetuvolem.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/internationalization_of_higher_education_in_india.pdfIn PDF document text
    • http://nejimafalun.onlinewebshop.net/how_to_do_spin_only_on_ge_washer.pdfIn PDF document text
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_1c06e49857144428ac27d120dadccc7f.pdf?index=trueIn PDF document text
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_0747a83ec0de404e9cea00cb401bf862.pdf?index=trueIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_b1427934b4a2486a80b9cf8fadbb59ba.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_off0000e33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33E 5164 bytes
SHA-256: 64340a3a658db18cc8cf1671494eb19b20a8e8308a1c57e281950eddba7e400b
font_01_sfnt_off0000f49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49C 10712 bytes
SHA-256: 78702c2c1f09826b9a1bf5aa79303572d8a0e609934c4070988eec66d8b6d9b3

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