Malicious PDF — malware analysis report

Static analysis result for SHA-256 af884af6e365ab1a…

MALICIOUS

PDF

74.2 KB Created: 2021-01-17 21:26:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 43ef7136825621886f07d020cf35ef1a SHA-1: 66f0912bc6629bdc6fb25e079c190ee69bfb5005 SHA-256: af884af6e365ab1a212a17f7056bb1811fed3b0b4cc93562340b3ee5d29131a0
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets and Weebly-hosted PDFs, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffking.ru/123?utm_term=how+to+get+white+dye+in+minecraft+1.16 PDF link annotation
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/rekabuwu-latam-nuvikenube.pdfIn PDF document text
    • https://mumetimobenuja.weebly.com/uploads/1/3/2/3/132302956/depebopibit.pdfIn PDF document text
    • https://losiweso.weebly.com/uploads/1/3/1/3/131380476/9ae2910d.pdfIn PDF document text
    • https://xigokujote.weebly.com/uploads/1/3/4/6/134649591/vifurujabip_xukis.pdfIn PDF document text
    • https://site-1176791.mozfiles.com/files/1176791/56258820973.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368741/normal_5fd29214c8df0.pdfIn PDF document text
    • https://gemenudotipetal.weebly.com/uploads/1/3/2/6/132695720/kakovagirad.pdfIn PDF document text
    • http://tokigarodam.22web.org/app_china_android_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/30866837879.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/nigoruwazodobasuvomofupad.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/mazigelipopikevazisuguj.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/wenepesewotelo.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/fexexupesebobutosifiwu.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/13746278426.pdfIn PDF document text
    • https://s3.amazonaws.com/moxekibupuru/2676127498.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_off0000e38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38D 5616 bytes
SHA-256: b1a3b3566a95183d613a2e5fc6ab3729e36ba44865f578082a6c820f52e9d547
font_01_sfnt_off0000f6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AA 10940 bytes
SHA-256: db69f7a6f2b21d873148f8394ca0a5eeb8c026116ac23827b2dc419bb7b3b803

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