Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd632708affd829…

MALICIOUS

PDF

77.9 KB Created: 2021-03-22 07:24:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4663a574eaaccf2848ef8590321bedfc SHA-1: 7e2bf09e2e88af89161b7ca9759283419a25ca4f SHA-256: 6cd632708affd829d2fa4a8bfe717e587c3c1f4291fc35c495be8a93059b7fc3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, a technique often used for SEO manipulation or to distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or trojan distribution. The embedded URLs and the PDF structure suggest an attempt to lure users to malicious sites or download further payloads.

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://zajinet.ru/123?utm_term=anemia+falciforme+pdf+diagnostico PDF link annotation
    • https://cdn.sqhk.co/wogokodu/jbbjbic/pac_man_game_y8.pdfIn PDF document text
    • https://cdn.sqhk.co/lukulobu/dwhb05b/lelizi.pdfIn PDF document text
    • https://cdn.sqhk.co/jumupebuvi/YWol3BA/alive_in_shelter_mod_apk_android_1.pdfIn PDF document text
    • https://puzagejezazi.weebly.com/uploads/1/3/4/4/134465952/c3c6dac88f36.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/6ec2717.pdfIn PDF document text
    • https://mebotorafegamor.weebly.com/uploads/1/3/0/7/130739377/3558072.pdfIn PDF document text
    • https://xifugewelude.weebly.com/uploads/1/3/4/3/134353264/4920075.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/I4sDggL/house_party_apple_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/zidezofa/njdagji/contradanza_piano_sheet_music.pdfIn PDF document text
    • http://segovozeperi.22web.org/jcpenney_deluxe_sewing_machine_precision_built_zigzag_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3eeb541e-75be-486c-a732-b1e279b2a932.filesusr.com/ugd/eaab1c_494e190116614735a4853dd9eb8308eb.pdf?index=trueIn PDF document text
    • https://882e4f53-a7e1-4d4a-89e8-a6e6d9f9b805.filesusr.com/ugd/9a13d2_dcab37e878a84647aa6066536cfff363.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xezonijida/tabla_de_densidades_de_liquidos_gases_y_solidos.pdfIn PDF document text
    • http://jiwimid.epizy.com/electrician_tools_names_and_pictures.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/do_androids_dream_of_electric_sheep_empathy_theme.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/kabitubepati.pdfIn PDF document text
    • https://1bf92926-22d0-44a1-94fb-b51843c41cd5.filesusr.com/ugd/762c1a_fa384ffd635c46cfa3a1616938affccb.pdf?index=trueIn PDF document text
    • http://sanonusujinuz.rf.gd/raliwuvekenabifuzijaf.pdfIn PDF document text
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_ceeaa92f5dd34c8ca38dfd958af51c30.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/80652830301.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_off0000edb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB3 5464 bytes
SHA-256: e3870a354d7d75196a971b195423e09c89e50a766bf22990b4c7fbc167c7bcbe
font_01_sfnt_off00010033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10033 12304 bytes
SHA-256: 281116030bd4b51b15a0f7c4a272c7a36eea89bae83923d09441d5265a026c40

Open this report in the interactive analyzer, or submit your own file for analysis.