Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f23e33107b705f0…

MALICIOUS

PDF

71.3 KB Created: 2021-03-22 10:00:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 42b4b26aafb2a341d655b059c27d3c4b SHA-1: 5be39f92801262fedd636ef822adb5d367deb0ee SHA-256: 7f23e33107b705f05ed9e0114a2f9bf4f7596d849aafbaa457a5c5f31090803a
216 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized PDF hosting sites, suggesting a link farm or phishing campaign. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK indicate a deliberate effort to create a large number of links for SEO purposes, likely to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://zajinet.ru/wix?keyword=the+earth+school+kigali PDF link annotation
    • https://s3.amazonaws.com/fokapikow/improvisation_for_the_theater.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/acetate_sheets_a2.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/JhaTLJZ/14397047820.pdfIn PDF document text
    • https://cdn.sqhk.co/gazejuruni/hCY55ih/77997717706.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarasam/gj4jizm/sonic_the_hedgehog_minecraft_skin.pdfIn PDF document text
    • https://tovijivesigaz.weebly.com/uploads/1/3/5/3/135327805/2556545.pdfIn PDF document text
    • https://sobixalotebi.weebly.com/uploads/1/3/4/0/134017917/zedibesowazafevan.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/pojuxe.pdfIn PDF document text
    • https://s3.amazonaws.com/ponivotigegepub/can_i_get_a_replacement_remote_for_my_roku_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/zitiwofiru/MWbidge/rubber_duck_hunter_free_download.pdfIn PDF document text
    • https://devarewiwigunum.weebly.com/uploads/1/3/2/7/132710712/418782.pdfIn PDF document text
    • https://cdn.sqhk.co/dabigewom/fE88dhf/iowa_city_ia_storm_damage_today.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/45503220562.pdfIn PDF document text
    • https://zujujoweb.weebly.com/uploads/1/3/5/2/135297083/kelibanirodo.pdfIn PDF document text
    • https://cdn.sqhk.co/nupepewomaxu/pji9fjd/math_worksheet_for_preschoolers_free.pdfIn PDF document text
    • https://cdn.sqhk.co/nuroteditu/henhcr7/49195562891.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/UifLJWN/wazepasopuvof.pdfIn PDF document text
    • https://gafeziluwer.weebly.com/uploads/1/3/4/3/134310472/9a7d3248b685.pdfIn PDF document text
    • https://cdn.sqhk.co/galudubujuwa/hrjcij5/best_deal_zone_now_reviews.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD771 5076 bytes
SHA-256: cc608c687b8e3219ad8037ef69c775422435f0a96956b64184140f5e12aa4f36
font_01_sfnt_off0000e8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AE 10984 bytes
SHA-256: 9812a1046ee8129ee8a9423eb9e76eb7319fa56a52bd07828fa4dc5427059eef