Malicious PDF — malware analysis report

Static analysis result for SHA-256 0166bceb0d32d82c…

MALICIOUS

PDF

77.0 KB Created: 2021-02-27 22:56:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 41f4d787c1af9ddf39b499ef74dffd30 SHA-1: 7a3c52dac66736feda79d150111f558c2ed60fc5 SHA-256: 0166bceb0d32d82caaacc6a65ae0a647da55365a94cff6b0b6e50945acff639e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous embedded URLs, with one prominent URL pointing to 'jacksth.ru' which is likely part of the malicious infrastructure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links on disposable domains, further supporting a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/123?utm_term=fluke+177+meter PDF link annotation
    • http://lenugaguv.medianewsonline.com/89513539422.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414358/normal_6029f5c7e97e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410211/normal_6010fec716078.pdfIn PDF document text
    • http://itfamily.info/721474129645w6sg.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/42537650372.pdfIn PDF document text
    • http://talezoruvaje.iblogger.org/22925684865.pdfIn PDF document text
    • https://kiwiwutirove.weebly.com/uploads/1/3/4/7/134707888/1427780.pdfIn PDF document text
    • https://jowatoziji.weebly.com/uploads/1/3/4/8/134893097/buwevaxepevared.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449998/normal_602d8cfe29e8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408719/normal_5fd0a10f27b5b.pdfIn PDF document text
    • http://lamaded.mywebcommunity.org/emerson_50_inch_led_tv_screen_replacement.pdfIn PDF document text
    • https://godosofebi.weebly.com/uploads/1/3/4/6/134651625/c0c281021fa2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459029/normal_6031493914300.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jobubiro.epizy.com/dolelaga.pdfIn PDF document text
    • http://kapirexazi.onlinewebshop.net/vexodozilo.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/hindu_tamil_news_paper.pdfIn PDF document text
    • http://putojeferef.rf.gd/accident_report_form_nj.pdfIn PDF document text
    • http://janabamimis.rf.gd/osteoporosis_guidelines_ireland.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_off0000f20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20E 4596 bytes
SHA-256: 8024a649f98fc77995fb3575a91aa6be8c7701f652d2628fbad96dc8e04b90f5
font_01_sfnt_off000101a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A9 10628 bytes
SHA-256: 72bb411ac140253b24cbb00f50bddc5e5902dc01c5de22700513d21d1d91c088

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