Malicious PDF — malware analysis report

Static analysis result for SHA-256 afa25f6a3ea7c037…

MALICIOUS

PDF

70.2 KB Created: 2021-03-03 14:39:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 7a97497de2352604d71319805d008c97 SHA-1: 6eca5fae2909a05feec73e930966b8c1341b268e SHA-256: afa25f6a3ea7c037ab02dd063c578d0c6e6aa2d1a6d617d28199bb568acbfa5b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically classified as phishing. While no scripts were directly extracted, the PDF structure and numerous external URIs are indicative of a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/123?utm_term=grade+2+spelling+words+alberta+pdf PDF link annotation
    • http://kiritisivasol.mywebcommunity.org/movie_maker_app_free_online.pdfIn PDF document text
    • http://zisuroto.mygamesonline.org/51994110261.pdfIn PDF document text
    • https://sorebupewuf.weebly.com/uploads/1/3/4/4/134447244/xetenegojenogimufu.pdfIn PDF document text
    • https://badumanonelom.weebly.com/uploads/1/3/4/0/134040969/gaxowene.pdfIn PDF document text
    • http://help-igcopyright.xyz/watch_shanghai_noon_online_hdbbsj4.pdfIn PDF document text
    • http://xegazinijitup.mywebcommunity.org/super_mario_land_3ds_cheats.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/jemazejodep/rusarevigewujorexupi.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/sbi_anywhere_personal_apk_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/12056012736.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/karl_marx_sociology_theory.pdfIn PDF document text
    • http://futikuzita.onlinewebshop.net/40_rules_of_love.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_off0000d55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55D 5604 bytes
SHA-256: d148ae010f16a9dede64d1f46fcce13aa98e8138ce5d2321eeec6648d26eca70
font_01_sfnt_off0000e88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88C 10280 bytes
SHA-256: 0118b062977ce952a7905e313236db38d1de7245768b542711f03bf0d674fbef

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