Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81ef5143e45b4ba…

MALICIOUS

PDF

74.4 KB Created: 2021-04-05 13:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 815fb07cd4e843052cba1af12870c98d SHA-1: ea6035ba5f36e1d95b12d12d2400b9eb45ee6ab8 SHA-256: a81ef5143e45b4ba522fa19af7a1d49bc115f5333d203503f13f33eb3ad40237
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest it is designed to lead users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/123?utm_term=dual+clutch+transmission+report+pdf PDF link annotation
    • https://banafazag.weebly.com/uploads/1/3/4/3/134325205/sepewa-xiveroziwozujut-midiri-lubotivav.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/zedasevif.pdfIn PDF document text
    • https://katalajoguv.weebly.com/uploads/1/3/2/7/132740778/9547813.pdfIn PDF document text
    • https://polovetanofup.weebly.com/uploads/1/3/5/3/135330247/nufitugonegi_rojeditoxonowe_zozefuze_tikinobebareg.pdfIn PDF document text
    • http://milesatel.mygamesonline.org/media_audio_visual_dalam_pembelajaran.pdfIn PDF document text
    • https://cdn.sqhk.co/vifutetax/cjhjfid/strategy_vs_tactics_chess.pdfIn PDF document text
    • https://ruvawuwejijexut.weebly.com/uploads/1/3/0/8/130814193/votemowago_bixakix_zisideku.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/0PLgh7Z/34359451569.pdfIn PDF document text
    • http://tujidal.mypressonline.com/letter_c_worksheets.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kivaxabobusited.epizy.com/suserixodugodexene.pdfIn PDF document text
    • http://bigapenegig.atwebpages.com/momegabitob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec489568-df3e-4931-8a47-7879f498005b/sonesejekugokote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28b0d5e5-50cc-42d8-b815-ae6ba94d5cd2/why_is_my_epson_scanner_scanning_in_sections.pdfIn PDF document text
    • http://najekaweza.onlinewebshop.net/29923068023.pdfIn PDF document text
    • http://panejolaraluka.rf.gd/welepaxuxadomevuvuwajalo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0436b8f2-7d07-4c62-bd29-90f54d952ec0/are_english_pointers_good_pets.pdfIn PDF document text
    • http://livirava.atwebpages.com/master_the_art_of_storytelling.pdfIn PDF document text
    • http://bukezodebas.onlinewebshop.net/34151578012.pdfIn PDF document text
    • http://wepikupovug.myartsonline.com/jekivefigenuwu.pdfIn PDF document text
    • http://muberugaguto.epizy.com/feng_shui_flying_stars_2020.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_off0000e577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE577 5396 bytes
SHA-256: 6c51543abbde84f760c8e5b5c5aa8b83bb98941dde5d56a1cc53499910171c53
font_01_sfnt_off0000f7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A9 10800 bytes
SHA-256: 71bb90d04162621796a07e312ab7dd91155f8078e7bfbf1a17f6085f5b55f180

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