Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab27630d14abf3a…

MALICIOUS

PDF

66.5 KB Created: 2021-06-11 21:38:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: e343e08a4579a25fd8812483de714ea5 SHA-1: 6ef2b5a510fa2db4282e4fc9ce11849c32e4fe39 SHA-256: aab27630d14abf3a4fb1476e81103659ad5af74c3bab681a8e3858ade81896c7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL leading to a suspicious domain associated with phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content, likely for credential harvesting or further malware 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://krisoc.ru/pbw?utm_term=capo+tuning+chart PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389353/normal_603cee7a0eab4.pdfIn PDF document text
    • https://jefiwoso.weebly.com/uploads/1/3/5/9/135996081/guredofapat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423780/normal_606da12f4f390.pdfIn PDF document text
    • https://mezamavizasiv.weebly.com/uploads/1/3/5/3/135312133/zovuduzenovipejemew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367268/normal_6001360f06885.pdfIn PDF document text
    • https://narobukedezupe.weebly.com/uploads/1/3/0/7/130738621/1897854.pdfIn PDF document text
    • https://towoxaji.weebly.com/uploads/1/3/0/7/130740158/0b2e29c9f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457570/normal_5feece4daac2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406793/normal_603d4461936ac.pdfIn PDF document text
    • https://bododomeliba.weebly.com/uploads/1/3/1/4/131408614/memidotosix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://masawumel.pbworks.com/f/esl_1st_and_2nd_conditional_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e49b08d0-72f6-4477-b7d9-f4fce60d5822/how_to_set_up_chauvet_obey_40.pdfIn PDF document text
    • http://silasofinat.pbworks.com/w/file/fetch/144727596/precio_sugerido_sabritas_2020.pdfIn PDF document text
    • http://doxawadar.pbworks.com/f/how_to_determine_current_carrying_capacity_of_a_cable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97b1f13f-af44-4d34-a28b-c015229e747e/the_book_of_the_damned_by_charles_fort.pdfIn PDF document text
    • http://nudifimixonu.pbworks.com/f/mtg_best_plains_decks.pdfIn PDF document text
    • http://javefanudosa.pbworks.com/w/file/fetch/144678156/g_switch_2_unblocked_weebly.pdfIn PDF document text
    • http://mifimoruzuwo.pbworks.com/f/beyblade_burst_sword_valtryek_qr_code.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_off0000c920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC920 4888 bytes
SHA-256: a7c9adccfca8b312ac72abfd1b45d762edcad608b8b3ea7669fec305ef5958ec
font_01_sfnt_off0000d9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BF 10372 bytes
SHA-256: 1f3e4eed2312d025461449eff2708c6829dd223f9e694b32e6ec778579aaf2ef

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