Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89d316ebb35883b…

MALICIOUS

PDF

83.6 KB Created: 2021-03-01 05:51:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: fe98f98022de4fcf2fecc586ea49a4b2 SHA-1: f3d19ca4489bf0c72d5b158b895382d924b4fe07 SHA-256: b89d316ebb35883badc45395039d074f930b9b7eb1dc91a8d858e27f9468dbee
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to academic paper formatting, which is then linked to external URLs for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=how+to+head+a+paper+mla+style PDF link annotation
    • https://paruvinuj.weebly.com/uploads/1/3/5/9/135970142/xejelukibabodov.pdfIn PDF document text
    • https://nabinavupofi.weebly.com/uploads/1/3/5/3/135350319/376b97465b28.pdfIn PDF document text
    • http://gatorama.site/kumuvedenirimixerepimukug54u00.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/fafudozizemakixarawip87lce.pdfIn PDF document text
    • http://walkover.me/survival_simulator_mod_money_apkn0jo1.pdfIn PDF document text
    • https://radufogerexe.weebly.com/uploads/1/3/4/2/134265868/ea128d1546cf.pdfIn PDF document text
    • https://xuxulavadimuxa.weebly.com/uploads/1/3/4/2/134234789/divupuviseru_pesefu_wazepo.pdfIn PDF document text
    • https://joluxowupowuxi.weebly.com/uploads/1/3/4/4/134478900/buvixedaxixiz_ruxusupokibe_gexalo.pdfIn PDF document text
    • http://lnstagramsupportingcenter.com/lg_wireless_earbuds_with_mic_reviewshulku.pdfIn PDF document text
    • https://vulabomanuxuw.weebly.com/uploads/1/3/4/8/134857085/2cdb61069.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://nifekubipaxo.epizy.com/rogejunejeterezuzoresafi.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/how_to_add_a_link_to_wix.pdfIn PDF document text
    • http://sobakijej.rf.gd/8631446506.pdfIn PDF document text
    • http://vufagozujidivu.epizy.com/steam_stuck_at_0_bytes.pdfIn PDF document text
    • http://dowulutidapewu.epizy.com/hayward_goldline_salt_system_calibration.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/varulubumakijipanekelo.pdfIn PDF document text
    • http://naziniri.epizy.com/elements_of_music_harmony_and_texture.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_off0000fe0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0D 4988 bytes
SHA-256: 20d82f35e797b157c5795662406608f92556215c431e2493c74a1ab30e4cd8cd
font_01_sfnt_off00010f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F15 10668 bytes
SHA-256: f86ef2aa4dd679cc8462e31fa493bbc1f51803662153bef21945f8c8f74d60bd
font_02_sfnt_off00013370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13370 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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