Malicious PDF — malware analysis report

Static analysis result for SHA-256 644dd4361dc3f7d7…

MALICIOUS

PDF

72.3 KB Created: 2021-02-23 13:50:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0e86ecbb5444f6138ca460c922d9438b SHA-1: 2a1b9acfec4c4c840fd0a06ee9f6961974a44c0d SHA-256: 644dd4361dc3f7d7dd8625ceb99a8d260a7baecd94de4b4c6698458082add820
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious 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 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.
  • 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://crophysi.ru/wb?keyword=how%20to%20hold%20a%20violin%20and%20bow In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368759/normal_60224d5012ed9.pdfIn PDF document text
    • https://tewifevorifoja.weebly.com/uploads/1/3/4/3/134387655/3158120.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387433/normal_5fe64691835ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427085/normal_60076ab284b97.pdfIn PDF document text
    • https://jovavogi.weebly.com/uploads/1/3/4/5/134597399/5853953.pdfIn PDF document text
    • https://cdn.sqhk.co/susojitigi/ehciagH/super_bomberman_online_2_player.pdfIn PDF document text
    • https://xajevopo.weebly.com/uploads/1/3/2/6/132682124/musukanokadawelogeg.pdfIn PDF document text
    • https://cdn.sqhk.co/zikufivol/wgfgfij/gadovotevobepimav.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/ihih5jg/download_underground_racing_rivals_mod_apk_android_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420600/normal_600f59b7ee57d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bojafazes/3421391792.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/74455896710.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/evanescence_anywhere_but_home_zip.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/guxelifofok.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/kolotiberanerom.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/destiny_2_steam_size.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/acorn_stairlift_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/add_hyperlink_in_google_sheets.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_off0000df42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF42 4892 bytes
SHA-256: 8a91bcb40606685a9cce444f0cceca613dfa1ec12e62aa75977828ff982a008b
font_01_sfnt_off0000eff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF7 10728 bytes
SHA-256: 2b988fe0c4ac64826f5b0b1c700c8213e49b24509f5c434f4cdb49ef72ddc0bd

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