Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0b097bb17f98c6…

MALICIOUS

PDF

86.2 KB Created: 2021-05-27 02:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1569ed7c56fc097aa25b73bbdc9292c9 SHA-1: d8507e6a760527f740a938f83db668676375db8b SHA-256: 8c0b097bb17f98c68e73f4ec6a64c939e2a41bb826f48118a3928e80bef94b13
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The document body, though partially obfuscated, appears to contain search query text, further supporting the link farm or phishing lure hypothesis. No scripts were extracted, but the presence of numerous external URLs is a primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://baarspo.ru/strik?utm_term=cuanto+es+5+pies+2+pulgadas+en+centimetros PDF link annotation
    • https://xikiwideb.weebly.com/uploads/1/3/4/7/134730665/disud-tuzev-vamoxugero-rezimanu.pdfIn PDF document text
    • https://sofakixejiz.weebly.com/uploads/1/3/4/2/134265497/lilorudesobedi-lagupej-zigif-kuxanopi.pdfIn PDF document text
    • https://togasiwivote.weebly.com/uploads/1/3/4/3/134370981/sisidofem-panitamomabig-lasetokafipi-gixuketaneja.pdfIn PDF document text
    • https://wexipemeb.weebly.com/uploads/1/3/4/8/134860193/lenukatiferago_jitajofom_dixevamev_pepulabetinizub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384310/normal_6017e02b9149f.pdfIn PDF document text
    • https://ragumavul.weebly.com/uploads/1/3/1/4/131483371/pijofux-sevidoderiwuro-xiwanekawevog-paxurofe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416125/normal_6042d4550e5ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450514/normal_5fce9f18e6a02.pdfIn PDF document text
    • https://tarivoda.weebly.com/uploads/1/3/4/6/134693378/3699907.pdfIn PDF document text
    • https://zefugomifavo.weebly.com/uploads/1/3/6/0/136087281/22400.pdfIn PDF document text
    • https://wavopotajulaja.weebly.com/uploads/1/3/4/6/134631105/rebuzedobo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426816/normal_601208abaa742.pdfIn PDF document text
    • https://lepekogiba.weebly.com/uploads/1/3/1/6/131637498/3178144.pdfIn PDF document text
    • https://lutafutenitar.weebly.com/uploads/1/3/4/3/134381418/sebukodujijo_serekupuleguwos_mafugifawisap_sawox.pdfIn PDF document text
    • https://zegijavevezedoj.weebly.com/uploads/1/3/4/3/134309525/gijidunarapexonoxiz.pdfIn PDF document text
    • https://faliroralomi.weebly.com/uploads/1/3/0/8/130874474/pixikanuxuli.pdfIn PDF document text
    • https://juxatameserog.weebly.com/uploads/1/3/0/9/130969062/97e0b5.pdfIn PDF document text
    • https://zumuwezejulo.weebly.com/uploads/1/3/1/4/131455722/4082105.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/2d516bc8-99d0-47b7-8c4b-075133af3834/rodetimejomefapazopanil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d9165ce-d315-4a95-a6ed-d0a5658b8e06/raxupak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07223cae-b92f-4aaf-a131-0dbcd0deb78f/lincoln_and_guba_1985_citation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/932c365a-f0e4-4987-8348-066612d0be73/84788429923.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97A 5556 bytes
SHA-256: 19d591b3444c6374068861bde29903b5b0e6c5109b2db2441a4a2b62cc3f95b0
font_01_sfnt_off00010c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C46 12000 bytes
SHA-256: 48647907e5928e08291812db996d554bb6abc9363ad8ae658c36ac97b38a9f7c
font_02_sfnt_off00013393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13393 16168 bytes
SHA-256: b2ac67756ccb9a38f0303b1ba820cb5c8b4ab6133599e7fd07ad9e712984a954

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