Malicious PDF — malware analysis report

Static analysis result for SHA-256 26bd84f3973dcd30…

MALICIOUS

PDF

80.8 KB Created: 2021-03-19 11:40:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1b046e48a186b389cf46c79f35b583c SHA-1: cfd4e446ce1f2bb6195ec42ad239b1ac54ed82a9 SHA-256: 26bd84f3973dcd3096318d59a7ae7de70510a3e2243d3a985cb48919e8e6fff3
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/123?utm_term=best+budget+spreadsheet+uk
    • http://mosilewuzofivan.iblogger.org/us_army_logo_iphone_wallpaper.pdf
    • https://cdn-cms.f-static.net/uploads/4419425/normal_6040790bdebc2.pdf
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/1387814.pdf
    • http://igclienteam.com/688062027114whb3.pdf
    • http://devgm.design/507615539899esqt.pdf
    • https://niraniki.weebly.com/uploads/1/3/4/6/134662237/9973048.pdf
    • https://cdn.sqhk.co/gujowaxexag/Gzhdgf0/12286164120.pdf
    • https://cdn.sqhk.co/rabuvimi/hmjeFNR/terutikegabunip.pdf
    • http://wide-take.top/confessions_of_augustine_onlinem7vlx.pdf
    • https://cdn.sqhk.co/gapebeve/ilHVjh8/samsung_health_monitor_ecg_apk_download.pdf
    • https://cdn.sqhk.co/moxibusas/Udge2IM/photo_studio_close_to_me.pdf
    • https://cdn-cms.f-static.net/uploads/4427514/normal_5fe98ee343dad.pdf
    • https://cdn-cms.f-static.net/uploads/4402289/normal_6044243ca3e1a.pdf
    • https://zagukosi.weebly.com/uploads/1/3/4/3/134314994/663955.pdf
    • https://cdn.sqhk.co/nowonipewo/5heGrie/2572933326.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nidalekunipu.epizy.com/bolojuxirufevamadala.pdf
    • http://raredinufewota.epizy.com/74806270949.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcc9.bin
8bbf4dfc4486ef26d3089ac385c4dc24c48cf5b20cf4877fea052ed9438b5ca4
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC9 5440 bytes
font_01_sfnt_off00010f3b.bin
8a8c0e20ae1dfbaf5fe0d08db4908fa63f956b5a9314703021a0ed1cc0c81b87
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3B 11548 bytes