Malicious PDF — malware analysis report

Static analysis result for SHA-256 625b2c6a3e09ca6e…

MALICIOUS

PDF

71.3 KB Created: 2021-01-04 09:29:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: cf894262897ec8488cb0b720d9f2539c SHA-1: c49cd459be97f5836bc9436766f0e23657db8481 SHA-256: 625b2c6a3e09ca6eb861cb10cdeb06bb6a0b36ace2e5aaa4507ec9952b5c06a1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of external links, many of which point to disposable hosting services and appear to be part of a link farm. The document body contains a search query for 'Insignia usb c to hdmi best buy', suggesting a phishing or scam lure. The presence of ClamAV detection and a high ML classifier score further indicate malicious intent, likely related to phishing or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/123?utm_term=insignia+usb+c+to+hdmi+best+buy PDF link annotation
    • https://gokixojegesefa.weebly.com/uploads/1/3/4/8/134864476/fefoxolulota.pdfIn PDF document text
    • https://jaxikagiwuzeno.weebly.com/uploads/1/3/4/6/134698588/7b384e1.pdfIn PDF document text
    • https://sevozinevuzejok.weebly.com/uploads/1/3/4/9/134903388/592f65003.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369651/normal_5fe964fac64c0.pdfIn PDF document text
    • https://tipefejiri.weebly.com/uploads/1/3/0/9/130969755/punadax-kazugokov.pdfIn PDF document text
    • https://wanuvimuz.weebly.com/uploads/1/3/4/4/134462356/zetakur_gisorogoz_kozediwodud_xogexutesu.pdfIn PDF document text
    • https://jizetexosobuwek.weebly.com/uploads/1/3/0/7/130740437/levewuvakiguwe.pdfIn PDF document text
    • https://wolegowagu.weebly.com/uploads/1/3/4/4/134404953/goledezisuj.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/a8b24306-e84e-4287-9906-551b0c1dc0db/89155941642.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/vikezazonelekoneredetuju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2564bfe9-4c9b-4e56-b3bc-750467df0842/hotel_management_file_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/bollywood_movies_mkv_2017.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_off0000dc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC23 5404 bytes
SHA-256: 70a453a6e93e8794582428df2ed87e9d57bc1e38da1c65c1415ecd9a3b0af891
font_01_sfnt_off0000ee66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE66 10040 bytes
SHA-256: 00f09786558b3ad340fc4301fce010c6c2a33125429c6b96c46dd48c5d3b34de

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