Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0ade1a6a98bc55f…

MALICIOUS

PDF

83.8 KB Created: 2021-03-30 19:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: dc686c34bcae8fa5d05b0f49a9ee87f4 SHA-1: 1d822fcceacf9088cc91c2e6d3a3e8b845e5a20f SHA-256: b0ade1a6a98bc55f0a184b7248b3a0913569a0a331b3c32be49d904b23835b87
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://midufefew.ru/123?utm_term=blackpink+forever+young+dance+practice+mp4 PDF link annotation
    • http://fezufizibum.mypressonline.com/admiral_heavy_duty_super_capacity_washer_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/jadepibake/ghiijhd/drift_trike_plans.pdfIn PDF document text
    • http://dusibarupuguli.medianewsonline.com/zygmunt_bauman_liquid_modernity.pdfIn PDF document text
    • http://yewes.fun/costanoan_tribe_information21p5m.pdfIn PDF document text
    • https://badumanonelom.weebly.com/uploads/1/3/4/0/134040969/nevupilunuw.pdfIn PDF document text
    • https://felekiki.weebly.com/uploads/1/3/4/6/134689652/eb6aef7675a1bd3.pdfIn PDF document text
    • https://nutarubanamu.weebly.com/uploads/1/3/4/5/134528768/julim.pdfIn PDF document text
    • https://junurewumopu.weebly.com/uploads/1/3/2/7/132740614/5194786.pdfIn PDF document text
    • https://lupexepiw.weebly.com/uploads/1/3/4/3/134318885/botinewe.pdfIn PDF document text
    • https://dapunilak.weebly.com/uploads/1/3/4/5/134506399/tewebamowulebifoja.pdfIn PDF document text
    • http://study-english-05.site/shiitake_mushroom_nutritional_informationit54c.pdfIn PDF document text
    • https://cdn.sqhk.co/rotuzuwibi/jgjdGMN/48192046553.pdfIn PDF document text
    • https://laxigotugib.weebly.com/uploads/1/3/0/9/130969680/d6a5851f.pdfIn PDF document text
    • https://wumibatolazonik.weebly.com/uploads/1/3/1/4/131437616/cf74404789d.pdfIn PDF document text
    • https://jexiliwole.weebly.com/uploads/1/3/0/7/130739190/997a55.pdfIn PDF document text
    • https://nokajadum.weebly.com/uploads/1/3/4/8/134887388/kofisazivavi.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/d8c91d63-479a-42f3-b1a4-b5921288f38d/xesix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68225289-bfc7-4bdf-9532-e46fc88224a9/80193113798.pdfIn PDF document text
    • http://vekejuf.atwebpages.com/lowemaramewubunowipagali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/134a6790-c512-4b8d-aa71-2ce266790406/84544885731.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69f4dd54-b4d8-470b-9078-fb19ed8e7070/rslogix_emulate_5000_download_software.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06E 6264 bytes
SHA-256: 0735f82ce8fe941c0e378f17ebaca44074f704aa1286ec2b8ce1b27bc07e01f0
font_01_sfnt_off0000e5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A2 5660 bytes
SHA-256: 9cbcd5a99799b0264c0bde7ef377feac387bb0063aaea66c901ff429b79aca3f
font_02_sfnt_off0000f8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F7 14084 bytes
SHA-256: 8dbd6d380efc9a967945fdb029af3e10db7cfd1bd8846aa83bb46ac665517bd9
font_03_sfnt_off00012359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12359 18776 bytes
SHA-256: dd3991069820e86ddc32efd8626bef291aaa92e32d8565aea86472f23d00ce1c