Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f41029fbfca711…

MALICIOUS

PDF

76.4 KB Created: 2021-04-28 11:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 64f5b7b4c369fcd719b721ff72b20937 SHA-1: debb5d153643b2f11b15c3bed3eeb16a07d67e2f SHA-256: 64f41029fbfca7112a92b6eb8b2ace4aa976da30f5a9bed71d3d7b309986e6d2
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links on disposable hosting suggests a phishing or spam campaign aimed at directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=little+sparrow+song+simon+and+garfunkel In PDF document text
    • https://fedusinejedutim.weebly.com/uploads/1/3/4/0/134040989/5288986.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/jeUkFog/20629794098.pdfIn PDF document text
    • http://vwwv-avito.online/bass_booster_free_iphoneqmobd.pdfIn PDF document text
    • https://cdn.sqhk.co/notigagamu/hbgdIgj/machines_like_me_free.pdfIn PDF document text
    • https://kafememum.weebly.com/uploads/1/3/4/6/134616831/fowis.pdfIn PDF document text
    • http://rafewasugajeze.22web.org/compile_jasper_reports_with_maven.pdfIn PDF document text
    • http://smirno.life/summary_of_the_chapter_the_last_leaf_by_o_henrybyzov.pdfIn PDF document text
    • http://axecheat6.xyz/razexevigutotisurufufewimtu2gw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_dc7271e814914c77848059f1c05f6477.pdf?index=trueIn PDF document text
    • http://nagatesi.epizy.com/35974293613.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/69451931885.pdfIn PDF document text
    • http://wojegopuda.rf.gd/does_aldi_do_gluten_free_food.pdfIn PDF document text
    • http://refesare.epizy.com/bearing_types_and_uses.pdfIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_76cf5de69e5048b2ad2de3146bcf03cd.pdf?index=trueIn PDF document text
    • http://pagitewuzowika.epizy.com/mejujexibaviler.pdfIn PDF document text
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_913797782aa84f21a170b53f2a9c5f08.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kefodek/62557750397.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/book_of_daniel_quiz_questions_and_answers.pdfIn PDF document text
    • https://9fc80a0e-b25b-4135-afeb-9811a1ea6bf8.filesusr.com/ugd/91e123_03e1c36673634548816de292663aedc4.pdf?index=trueIn 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_off0000ed64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED64 5456 bytes
SHA-256: e70e4f6a55cbf183b7f5f67503ca97d968b0b9668f072aea68ff11230852a613
font_01_sfnt_off0000fff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF8 10596 bytes
SHA-256: 363a9522d0c690a64cd39ff98d69c09528254291622ffafa43584d3ff7518f51

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