Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc681fa23916eb4f…

MALICIOUS

PDF

70.5 KB Created: 2020-12-25 05:46:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ea25adaaa223a9a95ad2347b41153ba6 SHA-1: 92b5067e909059677a2806266988ba9934db8453 SHA-256: bc681fa23916eb4fa34083e43fe114ae062e9ad26665454d681a05dbcb5b1e00
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a significant number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or redirection attempt, potentially using embedded JavaScript for obfuscation or execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/aws?utm_term=petco+guppy+care+sheet PDF link annotation
    • https://xisevulatunetu.weebly.com/uploads/1/3/4/5/134595014/99adec.pdfIn PDF document text
    • https://ranerenonosojib.weebly.com/uploads/1/3/1/4/131483420/2aa94de04f1a.pdfIn PDF document text
    • https://cdn.sqhk.co/dibatafuba/jjhgegc/english_nursery_rhymes_video_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/pozuwifofub/jeljfij/wujozajubapajuwibida.pdfIn PDF document text
    • https://xelemurefitarag.weebly.com/uploads/1/3/4/6/134601467/vobidabedoxufis.pdfIn PDF document text
    • https://besavikeneg.weebly.com/uploads/1/3/2/8/132815808/648937.pdfIn PDF document text
    • https://cdn.sqhk.co/zifalulog/4YieQVE/penozuzo.pdfIn PDF document text
    • https://funefazadoma.weebly.com/uploads/1/3/4/6/134648765/rizonun_kobovoweguj_maridiwisuwu.pdfIn PDF document text
    • https://darifojiwuz.weebly.com/uploads/1/3/4/5/134588766/diminokove_pixawe.pdfIn PDF document text
    • https://topodomero.weebly.com/uploads/1/3/2/6/132696018/1aa709cded9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b582d177-6eca-4f50-8b95-cab477715161/wenabobosimulimuza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0446a673-8e8a-4d23-a510-f116d3c0b9ac/tapazotulusefujuwokup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e19e339d-616f-4b2a-9037-71b33de4bb16/a_rainy_night_in_soho_the_pogues.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07963621-7413-4693-85ab-242f969372ad/ventura_star_obits.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_off0000d81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81D 5268 bytes
SHA-256: 6cb4042d13f44614d11fafc7eea594ff0147de7de6bf32deafea2f2baf28d8ac
font_01_sfnt_off0000ea0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0B 10380 bytes
SHA-256: 0cdc3770d36adaa9c7b883a1fd1b0bc45c3c16e2b86e1a02777854e14089a409

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