Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba556b70ac3dde4d…

MALICIOUS

PDF

58.2 KB Created: 2020-11-25 02:40:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34b11ea07ba092a61571da26a0c17130 SHA-1: 95152f318df9774466bd240b93f85aee55df43fd SHA-256: ba556b70ac3dde4d57f0c37bf12c33ed3acfa5a99a64b005ee64a8431184e7e3
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on suspicious domains and are likely part of a link farm designed to manipulate search engine results. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffine.ru/strik?utm_term=path+of+exile+best+class+2020+reddit
    • https://cdn-cms.f-static.net/uploads/4415081/normal_5fae081a822a5.pdf
    • https://sijodeteketede.weebly.com/uploads/1/3/4/4/134486162/zadivubanifunoginen.pdf
    • https://nidixinaxob.weebly.com/uploads/1/3/0/7/130739699/zugetijijote.pdf
    • https://pugoterofox.weebly.com/uploads/1/3/4/6/134608128/fetal-gorurix-wipavubagokip.pdf
    • https://zigexumo.weebly.com/uploads/1/3/4/7/134729800/beaa54f98.pdf
    • https://cdn-cms.f-static.net/uploads/4383565/normal_5f977eadd3722.pdf
    • https://cdn-cms.f-static.net/uploads/4451353/normal_5fa6007adaac7.pdf
    • https://maguduvogusimog.weebly.com/uploads/1/3/4/5/134583052/zetup.pdf
    • https://cdn-cms.f-static.net/uploads/4369506/normal_5fa4ffcce5eb1.pdf
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/vijeluwor_wuxixezoti_zumuvixerazevef.pdf
    • https://cdn-cms.f-static.net/uploads/4482020/normal_5fa7c0e89ae42.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pavujiniz/comparison_and_contrast_worksheets_for_grade_6.pdf
    • https://uploads.strikinglycdn.com/files/0800c5a0-a8ff-47b7-bf20-a715a3cecbd4/best_gifts_wife_2020.pdf
    • https://uploads.strikinglycdn.com/files/e991612f-c1a1-493d-9ea0-005ad366f0fe/nodemas.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ab44.bin
a21d76c347d31b74b8d766cac1887ba7b3805cdc6d40ce2463d9ab25831acfac
pdf-font-stream PDF embedded font (sfnt) at offset 0xAB44 5592 bytes
font_01_sfnt_off0000be45.bin
fe6aa64bef1c4e7257cbb43caee5a80b5067da69f890d2139db83c9569bb59f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE45 8744 bytes