Malicious PDF — malware analysis report

Static analysis result for SHA-256 79dcb58a179eae91…

MALICIOUS

PDF

86.9 KB Created: 2021-04-13 06:40:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8ace1c8e463df4cf38cee9b214a73068 SHA-1: b762637018646cfc6d21ea4b7f5a0e916a61a99c SHA-256: 79dcb58a179eae913e48de610c57319c13517c0440cb3b79d80e7400afe04150
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to suspicious domains and are likely part of a link farm for SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs suggest the primary goal is to redirect users to malicious sites, potentially for credential harvesting or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://leonvi.ru/strik?utm_term=frases+del+libro+historia+universal+de+la+infamia PDF link annotation
    • http://kprovk.xyz/538452239258xr96.pdfIn PDF document text
    • https://xizirujikalowev.weebly.com/uploads/1/3/1/4/131454807/wasiruvun-tanikuzupotimu-ruberipubanafu.pdfIn PDF document text
    • http://simultaneously.space/wavepodepopudupoxixat6gfg.pdfIn PDF document text
    • http://a1metromovers.com/mavikawekotasewexuvezki8t.pdfIn PDF document text
    • http://yognat.space/sanenudn5uxz.pdfIn PDF document text
    • https://butilitari.weebly.com/uploads/1/3/3/9/133997497/pivudo-disimepadijetus-bibalaroj.pdfIn PDF document text
    • https://tawatoxox.weebly.com/uploads/1/3/4/0/134018263/jimejelorekon.pdfIn PDF document text
    • http://train-home.ru/duxivaxasuvumuwivizuwutv726t.pdfIn PDF document text
    • https://gigazubexu.weebly.com/uploads/1/3/4/6/134613152/8319862.pdfIn PDF document text
    • http://doucheapp.xyz/theme_windows_10_black_editionmhecg.pdfIn PDF document text
    • https://fumitalabojaluk.weebly.com/uploads/1/3/5/3/135399187/wixepufinal.pdfIn PDF document text
    • http://microbestdigitalmeter.xyz/safety_hazards_in_the_workplace_examplesbfltg.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://bujoginivela.epizy.com/alcibiades_socrates.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/zaxupolak.pdfIn PDF document text
    • https://s3.amazonaws.com/widetunipet/cabal_private_server_indonesia.pdfIn PDF document text
    • http://borinalujid.epizy.com/year_one_subtraction_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/past_simple_beginner_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/vcf_cutter_free.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/dewalt_20v_max_brushless_cordless_circular_saw.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/which_nespresso_vertuo_pods_are_best_for_latte.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/tedifitazaguzixiluk.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_off000106db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DB 5184 bytes
SHA-256: bf5c3293b250d40abc3f5b57c1d4400613f450bef36091158812593b01657f75
font_01_sfnt_off0001184a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184A 11628 bytes
SHA-256: c2cd7c982ae3780e2d8e9574ced911b85e414a4783c90209be34987acc412e6f
font_02_sfnt_off00013dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD4 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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