Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eff6e7d2d621439…

MALICIOUS

PDF

75.0 KB Created: 2021-02-06 18:59:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9a21e5a1928c287c35333377a9ae29a6 SHA-1: 0d08f7abc28430415a1497248ab07228cdbfe39e SHA-256: 1eff6e7d2d621439fe8e8ae8797265f1d103daf1da5b939f4595450182226f3a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://druttle.ru/123?utm_term=minecraft+zombie+pigman+drops PDF link annotation
    • http://ontrade.top/49611748431iyo0e.pdfIn PDF document text
    • https://cdn.sqhk.co/jetekujob/fjcdjfi/93582365552.pdfIn PDF document text
    • https://cdn.sqhk.co/gitopedevid/FOiabhh/domino_s_pizza_in_raynham_massachusetts.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/djgigft/kumonewujavavugisexap.pdfIn PDF document text
    • http://sweetmeet.online/call_of_the_wild_essay_topicsstk4h.pdfIn PDF document text
    • https://cdn.sqhk.co/mifimafonuku/ibjfhcg/overkill_elimination_song_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/xugosovemi/k9Wgejc/tolifurowenupej.pdfIn PDF document text
    • http://nekevofitoruzat.22web.org/antioxidantes_endogenos_y_exogenos.pdfIn PDF document text
    • https://cdn.sqhk.co/joduragenep/JgdTmUX/49708311211.pdfIn PDF document text
    • http://akmurzina.com/707211493098lawp.pdfIn PDF document text
    • http://tubudemawaxoki.iblogger.org/91127842246.pdfIn PDF document text
    • http://kutakelipaxeb.22web.org/gujixoponemazixusanozugus.pdfIn PDF document text
    • http://kefets.xyz/the_hundred_years_war_impactss8nuc.pdfIn PDF document text
    • https://cdn.sqhk.co/gukisafuw/dIihjeW/word_puzzles_with_answers_for_adults.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tivogowajap.epizy.com/91621055860.pdfIn PDF document text
    • http://jubuzixabes.rf.gd/coeliac_disease_uk_guidelines.pdfIn PDF document text
    • http://kasegame.rf.gd/interjection_sentences_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/51762740895.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83D 5636 bytes
SHA-256: ec526152c10a177d2ad188b192a527b4c7cf23c77f34407b70528efdcc12387a
font_01_sfnt_off0000fb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB63 10368 bytes
SHA-256: bfafcca97bed8f42694390f569e6352f2bc4174e73bacd1f766a3dc7ffa9cab8

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