Malicious PDF — malware analysis report

Static analysis result for SHA-256 2651fd118b286b84…

MALICIOUS

PDF

77.2 KB Created: 2021-06-02 15:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c33aadd9381e3033e40948f4ceeda8eb SHA-1: 107ed2170361da7719d6d47ab17f02b49f439807 SHA-256: 2651fd118b286b8416ce3d100c403042868a5b01224eadf92799229785966725
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/pbw?utm_term=how+to+start+a+conversation+between+two+friends PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4492897/normal_60212b58679ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490917/normal_6052d00300163.pdfIn PDF document text
    • https://dakubotamijez.weebly.com/uploads/1/3/2/7/132712147/731897efec26356.pdfIn PDF document text
    • https://mafenipo.weebly.com/uploads/1/3/4/8/134879688/kazekiju.pdfIn PDF document text
    • https://betedodokadez.weebly.com/uploads/1/3/4/8/134882186/e5d0a1316.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457561/normal_5ff06ffd358b7.pdfIn PDF document text
    • https://kazofinuso.weebly.com/uploads/1/3/4/3/134369681/waxoja.pdfIn PDF document text
    • https://nitowapesapu.weebly.com/uploads/1/3/4/4/134442046/jotez-nureselun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446512/normal_60603ed778920.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386365/normal_6019ca264ce54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477155/normal_60100e7dc9b6a.pdfIn PDF document text
    • https://boxenujevodaziw.weebly.com/uploads/1/3/1/0/131070305/tusodakotosegus_zitem_konufoweteve.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481271/normal_5fe234f231ee4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366337/normal_60472cafe0399.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420745/normal_604da3776f8b4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vifogajo.pbworks.com/w/file/fetch/144487566/pukolalovofuvevamituxun.pdfIn PDF document text
    • http://tusoxefum.pbworks.com/w/file/fetch/144458781/next_launcher_3d_apk_full_2020.pdfIn PDF document text
    • http://tufukamapaf.pbworks.com/w/file/fetch/144498777/ignou_assignment_front_page_in_hindi.pdfIn PDF document text
    • http://liwuvedesisu.pbworks.com/f/75405574366.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07D 5236 bytes
SHA-256: df665e028c50f9944ef0155a865e58c670bf6dd33699ab3c13d3f1a3a5071132
font_01_sfnt_off0001026f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026F 10820 bytes
SHA-256: 4e10c3a23a1c023b54e1f7994b5c6c163163e4fe59f621e884be20cc77772061

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