Malicious PDF — malware analysis report

Static analysis result for SHA-256 d691da10c25ac22b…

MALICIOUS

PDF

68.2 KB Created: 2021-06-03 14:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9dc20d492fe992a8d019cc6f1c48c477 SHA-1: e27852bf8da9dcfa3175be6a1e757453078967cc SHA-256: d691da10c25ac22b5385f80c398b3362cdb25be9764010cde72971073e99cf7e
186 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 disposable hosting services, indicating a link farm designed to redirect users. The document body, though partially corrupted, suggests a lure related to 'Mitosis and meiosis comparison worksheet answers'. The presence of numerous external URIs and the ML classifier's high confidence score strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://drafthe.ru/pbw?utm_term=mitosis+and+meiosis+comparison+worksheet+answers PDF link annotation
    • https://rewiwolidinagi.weebly.com/uploads/1/3/4/4/134481042/mitik_gomaxuluzake_sivareliragesib_budojajo.pdfIn PDF document text
    • https://gaburizopa.weebly.com/uploads/1/3/1/4/131438784/jitot_zavapafakagoxil.pdfIn PDF document text
    • https://nipaxibovaj.weebly.com/uploads/1/3/1/3/131379211/jefasoxozojetigowun.pdfIn PDF document text
    • https://ganegekisawaji.weebly.com/uploads/1/3/1/4/131406809/mabev.pdfIn PDF document text
    • https://tezilejesitox.weebly.com/uploads/1/3/1/1/131163634/5517014.pdfIn PDF document text
    • https://sixupotivene.weebly.com/uploads/1/3/4/3/134305687/1189458.pdfIn PDF document text
    • https://rakuwogu.weebly.com/uploads/1/3/4/8/134858672/kaluwet-zaxoxekivo-duvex-peviwiwobosanu.pdfIn PDF document text
    • https://lekozeva.weebly.com/uploads/1/3/5/9/135964777/vejudolixufi-butubagokuvud.pdfIn PDF document text
    • https://rogebupapopax.weebly.com/uploads/1/3/0/7/130739826/3830632.pdfIn PDF document text
    • https://poteboxamakimef.weebly.com/uploads/1/3/4/3/134325651/f2aee.pdfIn PDF document text
    • https://lijemokuw.weebly.com/uploads/1/3/4/8/134853622/xinabupobit_risozafizilaka_vefiferobibi_nuvigovuz.pdfIn PDF document text
    • https://powonevupurig.weebly.com/uploads/1/3/4/7/134704952/5202271.pdfIn PDF document text
    • https://mixajogidevo.weebly.com/uploads/1/3/0/9/130969427/poxuwop-fodidagela-gafut-sifemovo.pdfIn PDF document text
    • https://repadugudemi.weebly.com/uploads/1/3/0/9/130969496/4265786.pdfIn PDF document text
    • https://dimazemoredexi.weebly.com/uploads/1/3/5/3/135309177/jopakenewezal.pdfIn PDF document text
    • https://nagaxubonafebax.weebly.com/uploads/1/3/1/6/131606673/6276636.pdfIn PDF document text
    • https://votilolezin.weebly.com/uploads/1/3/4/3/134307270/watogerikidar_jevebizabul_xebefoxonedepa_roxigijomoge.pdfIn PDF document text
    • https://widosutolitidaf.weebly.com/uploads/1/3/4/8/134847614/aa21989c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e9b5013-7060-4084-b14a-7f9dd09910a8/nobonepefexisejude.pdfIn PDF document text
    • http://jitilabajeko.pbworks.com/w/file/fetch/144515868/victory_thoth_tarot_card_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e301ab66-642c-4ae7-9b50-f34d0c6e347c/41012174785.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c2b6c3d-5bf6-4ad9-a03d-1c8a8c7c9e78/19055573202.pdfIn PDF document text
    • http://namikikis.pbworks.com/f/gastritis_diet_chart_in_hindi.pdfIn PDF document text
    • http://fixunomavow.pbworks.com/w/file/fetch/144475230/gravity_guy_unblocked_barber_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72ed9728-4eb5-488c-9456-902aebdd5023/best_price_for_weber_genesis_ii_e-310.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_off0000ccf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF2 5444 bytes
SHA-256: 3b8b603a624c160d9e2e38e04b758b33bf183f525585da9c955792d8bf82cd34
font_01_sfnt_off0000df6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6B 9800 bytes
SHA-256: 109aca5c2b15b4227781eb7e9ffd454e36de76f1624e9fe2f44b33ae3b612aa1

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