Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f1df4b284b7b6e8…

MALICIOUS

PDF

91.1 KB Created: 2021-03-23 01:28:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ce74f5b853d21742017be26042af12e9 SHA-1: 17e923d810fe42ee658526b4e8f0527e607ff50c SHA-256: 1f1df4b284b7b6e8618785eb429daa1b0bdda7183e602e2d358ad6a1ed192789
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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://nipisod.ru/aws?utm_term=blood+bowl+dwarf+painting+guide PDF link annotation
    • https://cdn.sqhk.co/wukomidekepu/5IigVOx/minofumafokala.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366660/normal_5fd1c4dde747e.pdfIn PDF document text
    • https://jesokawafaz.weebly.com/uploads/1/3/4/6/134626724/8dac776815.pdfIn PDF document text
    • https://towipikegogu.weebly.com/uploads/1/3/4/6/134690187/8555177.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/xpJ0hag/machine_gun_kelly_height_in_ft.pdfIn PDF document text
    • https://cdn.sqhk.co/tatomaxeriri/ibNfhfa/cisco_2960_x_series_configuration_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420930/normal_6052a72c06c81.pdfIn PDF document text
    • https://valojeruxul.weebly.com/uploads/1/3/4/6/134681631/vujazajaku.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/A1Cvigg/20334350119.pdfIn PDF document text
    • https://cdn.sqhk.co/pevejotomoma/jiIUUhe/befenipikevosokovoniliri.pdfIn PDF document text
    • https://jitedutakawu.weebly.com/uploads/1/3/4/7/134712839/d4c8e4a1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420239/normal_5fcd67e72bcfa.pdfIn PDF document text
    • https://cdn.sqhk.co/paparidew/jagb93Q/ralphs_open_on_christmas_near_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449185/normal_5fc5a27719039.pdfIn PDF document text
    • https://sixagezox.weebly.com/uploads/1/3/1/6/131606695/afd50.pdfIn PDF document text
    • https://cdn.sqhk.co/lubometusoz/0Fhajdq/national_corvette_museum_schedule.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/xilasisefi/nizuwelet.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/bond_energy_chem_worksheet_16-_2_key.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/savasaxoxasekowagixe.pdfIn PDF document text
    • https://s3.amazonaws.com/jujojomojemiz/zogazowalovabupijegopat.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/93465065018.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/arcsight_linux_connector.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_off0001293a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293A 5312 bytes
SHA-256: 95cd368436d09da2408f316cd3dee59430408d70d53f68bb90bbc3204d53b6a5
font_01_sfnt_off00013b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B72 10416 bytes
SHA-256: 3930e69d994f0f16f4dc929fe4dc7a1a5506c407f793cf39bc126f0efee0a69d

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