Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a763d27abac239…

MALICIOUS

PDF

71.1 KB Created: 2021-02-13 23:29:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 8456e82cbbf9bc0b64e6eb20fd7927e9 SHA-1: 49387111b7942fdd81f4af7ceaf2c2b945f47fbb SHA-256: 13a763d27abac239005d15c82d09e0909c243c3e6988524161f6af1f73154c17
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to SEO-optimized PDF files hosted on various platforms, suggesting a link farm or phishing lure. The primary URL, https://jottigo.ru/wix?keyword=basics+of+keyboard+theory+level+4+answers, is presented as a search result for "basics of keyboard theory level 4 answers", indicating a social engineering pretext to encourage downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jottigo.ru/wix?keyword=basics+of+keyboard+theory+level+4+answers PDF link annotation
    • https://xisevulatunetu.weebly.com/uploads/1/3/4/5/134595014/490410bd632e9b.pdfIn PDF document text
    • https://cdn.sqhk.co/kamavedes/jbmihzn/best_29_card_game_app.pdfIn PDF document text
    • http://justiciaforjustice.com/lebukoraje98fvb.pdfIn PDF document text
    • https://cdn.sqhk.co/dexediwiboze/fRbsoOd/pocket_knife_sharpener_ebay.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/ugdihUF/makeraresu.pdfIn PDF document text
    • https://cdn.sqhk.co/malofavu/qQjehdv/zaxiseg.pdfIn PDF document text
    • https://rurevudo.weebly.com/uploads/1/3/4/2/134265418/tixemefolavi-poworetavaxal.pdfIn PDF document text
    • http://avlto.best/dixuvuve87dvn.pdfIn PDF document text
    • http://helplnstagramcontact6088756.com/tiwupejb7sh.pdfIn PDF document text
    • https://cdn.sqhk.co/wunasesev/ic1wHhh/butozububeb.pdfIn PDF document text
    • https://cdn.sqhk.co/dapumexader/gyXhgOb/doxedizudewes.pdfIn PDF document text
    • http://alcexpress3.xyz/guxiretow6do4o.pdfIn PDF document text
    • https://guxadudupis.weebly.com/uploads/1/3/4/7/134751999/kavavomenedagaxetu.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/biwuwukesazef/river_bishop_briggs_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/cnn_reports_cecil_the_lion.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/96717219195.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/chunky_heel_platform_shoes.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/daihatsu_rocky_f78_workshop_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/85829817189.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/43780131572.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/vawasexigiwefut.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_off0000d59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59D 5704 bytes
SHA-256: 052f90355fe218380ad96732f24ef2323b45aefbe63e7538de6792fc37202373
font_01_sfnt_off0000e927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE927 10296 bytes
SHA-256: 555ef3dd80199f7b8bf3ed52878ccada6cd8c4c1865e2e479bc165707170e21f

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