Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b46ae00badd3d3…

MALICIOUS

PDF

78.0 KB Created: 2021-03-05 10:28:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: ff6f76d6d6e337fe976bc2129353e53c SHA-1: f508b038381e6113cb9a8b410ebc171a2584d7ae SHA-256: a3b46ae00badd3d38f52be8c4477141c34611904abf05ea23c225a95c742b805
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting it is part of a link farm designed to drive traffic or host malicious content. The presence of a UTM term in one of the URLs indicates a tracking or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://ponafet.ru/strik?utm_term=ferrari+testarossa+engine+oil PDF link annotation
    • https://cdn.sqhk.co/duvapegoleva/EigtcUT/naia_women_s_soccer_tournament_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/wibononuve/KkTijbj/turawusavog.pdfIn PDF document text
    • https://cdn.sqhk.co/musamari/jhidhhV/bexavokusimegerugo.pdfIn PDF document text
    • https://cdn.sqhk.co/jegamaxegev/Pif8ifa/motorcycle_wallpaper_hd_1080p_desktop.pdfIn PDF document text
    • https://cdn.sqhk.co/fufeboxeri/ejfiijd/wizer_me_teacher_login.pdfIn PDF document text
    • http://usacarins.com/metapizamamujemlq8u.pdfIn PDF document text
    • http://kismyketio.com/146850710343qsvb.pdfIn PDF document text
    • https://cdn.sqhk.co/zoburawava/WifQdgh/728354672.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://30c74dc1-c3f2-4e71-8253-1ec84f3b94e1.filesusr.com/ugd/b8c6fa_14d79c9fae41452bb55eaf3ba09d66cf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c7cb5a3-2900-4f2b-8945-4e6b11d5dd72/pak_study_mcqs_10th_class.pdfIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_f616bf120715438691a5d24d0dac932d.pdf?index=trueIn PDF document text
    • http://bitujavoza.epizy.com/63736200767.pdfIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_c72349f3d9fe41fdbda63f1e0a66aa8d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fef92a72-fa34-40d2-b853-4e228f016dc4/joker_dialogue_in_murray_show.pdfIn PDF document text
    • https://e1cd7dcf-8988-4be8-9b1a-722367337987.filesusr.com/ugd/6203b9_c77fcb05f3af4f4990a50e84d613a8de.pdf?index=trueIn PDF document text
    • http://zakivijojinikij.epizy.com/forum_atelier_801_transformice.pdfIn PDF document text
    • http://lobunuwofapow.rf.gd/43157281520.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7e69f15-c012-4247-a795-9021a1900b91/spelling_practice_book_grade_4_teacher_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32d2e917-2e9e-42b3-8467-43e7c89d2ff0/is_metabank_prepaid.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_off0000f610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF610 4808 bytes
SHA-256: 7049b8db009c40f451556799cde3b5a0a12418258ebe5d0cfbea318817b97cba
font_01_sfnt_off00010679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10679 10740 bytes
SHA-256: 42fa93128d61de2abb041773a9cd8179554e19a3ad503b9f430e843be194107d

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