Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c363b7280eab506…

MALICIOUS

PDF

72.8 KB Created: 2021-06-11 13:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2cc163640daa89b98d51660d055a1db0 SHA-1: 040f8c4b59eaa9967cba4df5eaf3c00d984579a7 SHA-256: 6c363b7280eab5061a46ef5b8c1a8f00bfc133b21187efd19c3e75c0846dc4e4
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/pbw?utm_term=kirby+super+star+ultra+nds+rom PDF link annotation
    • https://fekolulowezomo.weebly.com/uploads/1/3/4/5/134593542/wuvumijilot-mikuwanifi-zepajaxabej.pdfIn PDF document text
    • https://saditifoba.weebly.com/uploads/1/3/5/3/135325123/6500552.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476443/normal_601a7d5b94e4f.pdfIn PDF document text
    • https://mamonujiduvef.weebly.com/uploads/1/3/4/5/134525279/d56b944c.pdfIn PDF document text
    • https://vejugowe.weebly.com/uploads/1/3/4/5/134506523/2acb03e556e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486982/normal_60503fe78d87c.pdfIn PDF document text
    • https://tujelogujonugi.weebly.com/uploads/1/3/4/4/134491942/6818707.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422137/normal_5feafd8a96296.pdfIn PDF document text
    • https://sepolekabu.weebly.com/uploads/1/3/1/6/131606201/2242577.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_5fda47072cd00.pdfIn PDF document text
    • https://bosesabefo.weebly.com/uploads/1/3/4/3/134362720/4565251.pdfIn PDF document text
    • https://zenerabu.weebly.com/uploads/1/3/4/8/134870876/werex.pdfIn PDF document text
    • https://zipibolusoxa.weebly.com/uploads/1/3/4/6/134627603/pilebaviminamoku.pdfIn PDF document text
    • https://fazizutedo.weebly.com/uploads/1/3/4/7/134768054/jubasa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://botinuba.pbworks.com/f/lerukesesafuj.pdfIn PDF document text
    • http://fevawigo.pbworks.com/w/file/fetch/144662172/nomiraxulaxelobif.pdfIn PDF document text
    • http://razevolo.pbworks.com/f/rujor.pdfIn PDF document text
    • http://mogulobobis.pbworks.com/f/24266903784.pdfIn PDF document text
    • http://tusawijer.pbworks.com/f/building_monomers_of_macromolecules_marshmallow_lab_answer_key.pdfIn PDF document text
    • http://kizisoj.pbworks.com/f/90180446116.pdfIn PDF document text
    • http://vevokofeju.pbworks.com/w/file/fetch/145100589/babibuvosanibutagatidig.pdfIn PDF document text
    • http://laxaxufudej.pbworks.com/f/do_officeworks_take_passport_photos.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_off0000dede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDE 5316 bytes
SHA-256: a2380194559bb2596189a0986c7fe495f9a2e4cf24e5b0617dde424a3b51d385
font_01_sfnt_off0000f0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DA 10600 bytes
SHA-256: 62222cf677fb34d18243c6c0a5468c089777b04450fc9d6ca9d6101eac87db54