Malicious PDF — malware analysis report

Static analysis result for SHA-256 716cb2df18411045…

MALICIOUS

PDF

77.9 KB Created: 2021-04-27 05:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: aa3c732264f89bd223bd340672ae2421 SHA-1: 265780f9b058b384e469cb7fe483c44ea6a37aed SHA-256: 716cb2df184110458bb8c894d39a4280ba9c9112bd4f7b9dc04a86cdf7a85531
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to benign-looking PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary external URIs, https://jacksth.ru/strik, is identified as a potential phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=decision+tree+implementation+in+python PDF link annotation
    • https://cdn.sqhk.co/navuwamas/Niawvx6/winolavijubupiwer.pdfIn PDF document text
    • http://raxuvedibu.22web.org/nipilizukodajunewabowan.pdfIn PDF document text
    • https://cdn.sqhk.co/lerapuraroke/ghiJKah/sisters_oregon_fire_map.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://uscarinsurance.info/doxinitataferufimuvibipyt4t.pdfIn PDF document text
    • https://cdn.sqhk.co/fusaduxuw/eRaDjfd/1366x768_hd_gaming_wallpapers_for_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/fagesupuwe/fggIhu3/robbery_bob_2_free_ios.pdfIn PDF document text
    • http://dkblogin-de.best/bulleit_bourbon_whiskey_priceh70su.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://36ba0bd5-485c-4bd5-924f-6a5e18dcb854.filesusr.com/ugd/96419b_5210573995d14c38be03f80969655dce.pdf?index=trueIn PDF document text
    • http://nasuxenabo.epizy.com/meaning_of_academic_performance.pdfIn PDF document text
    • http://jineninu.rf.gd/ps2_controller_schematic_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/tewenilutag.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/blood_bowl_new_edition_rules.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/panasonic_th-42px75u_weight.pdfIn PDF document text
    • https://9305c775-266c-4126-9ef9-90a5cffee957.filesusr.com/ugd/c3f88d_4417bd6e46ef4fa5a06423eb9707af13.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/remavuj/54701571505.pdfIn PDF document text
    • http://fakupomajokiwe.rf.gd/assumption_of_cost_volume_profit_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/67870697392.pdfIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_83ce265548674ba19339b150fbebb8ad.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/patilawasu/xobatobovaditemejitobe.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/39789113737.pdfIn PDF document text
    • https://14da0a27-f261-4d4b-8668-3a369f5c966d.filesusr.com/ugd/46429b_ffac746766294c94983b7d59b6db27bf.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_off0000f127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 5272 bytes
SHA-256: aaa440a2e6618ffa55c76ae73d360b61696e57cf3a44ed8f5cbee439092677bb
font_01_sfnt_off000102f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F3 10860 bytes
SHA-256: b552598f9c59f5719d7750b4fb5a0e3f6bb834c732c76cfb11e2222ee6e877d0

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