Malicious PDF — malware analysis report

Static analysis result for SHA-256 c48e34ba7d8c03bc…

MALICIOUS

PDF

99.6 KB Created: 2021-03-20 14:53:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 2cd540c4adc581024927185fa309ae9d SHA-1: 95c3074d46cd3020b4e0e81d091f67c53965e864 SHA-256: c48e34ba7d8c03bc5c0eabdaf9f7f5dfc46f60b05dbb80abcc25971990fb8838
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/award?keyword=assassin+s+creed+odyssey+guide+book+pdf PDF link annotation
    • http://indohealth365.online/92398157757f95oe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415065/normal_6040aa2629d70.pdfIn PDF document text
    • http://richteam.site/how_much_is_a_husqvarna_450_chainsaw2kbqb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492871/normal_5fece6517261c.pdfIn PDF document text
    • https://zatalabevixet.weebly.com/uploads/1/3/2/7/132741241/b5dc8957a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416930/normal_600f51925dbc9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412778/normal_5ff4cbd2211d3.pdfIn PDF document text
    • https://xutifivaluladar.weebly.com/uploads/1/3/4/3/134337767/1657679.pdfIn PDF document text
    • https://dakikizubebara.weebly.com/uploads/1/3/4/8/134889455/98ce47ec8093c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463005/normal_5fd0f23bd4ed2.pdfIn PDF document text
    • http://atomlinux.com/16611491235j6cze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456391/normal_60052f9dcb079.pdfIn PDF document text
    • https://xiwabedosebu.weebly.com/uploads/1/3/1/3/131398066/rovusixobafegor-zugezemu-kexibadukafen.pdfIn PDF document text
    • https://nozudepoget.weebly.com/uploads/1/3/1/1/131163917/gifoxuf-fapal.pdfIn PDF document text
    • http://fomuvegikutidob.iblogger.org/optc_android_republic_ialex.pdfIn PDF document text
    • http://dofegogojewipo.iblogger.org/love_stargirl_full_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://569e8712-2873-4b93-a654-ea71b6b809e3.filesusr.com/ugd/345929_1e10b6a4cfa44cbbadb617ee392e0c66.pdf?index=trueIn PDF document text
    • https://af431a04-9ebc-4ea4-a98d-45e4ffbfad14.filesusr.com/ugd/485053_cd9ea5e4e90b45ca9c5922d7ff4d8e5a.pdf?index=trueIn PDF document text
    • http://mutijisugo.epizy.com/dinemubenopitadetinomu.pdfIn PDF document text
    • https://52aa71f3-9574-4e96-898b-bb16aa893b2c.filesusr.com/ugd/b13a71_220a4e2957344a16b7a5aa799cdcda18.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13928 5388 bytes
SHA-256: 0033a69f0c91015a90069b5d362ce810198e482fcd069c152d7d0811911c63ca
font_01_sfnt_off00014b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B7C 11532 bytes
SHA-256: e68fbee4ae4b5488a1d13e2806563363870400eb91aa0e34df5865eeeaf998a3
font_02_sfnt_off000172d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172D7 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361