Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2e64e9b09b6e61c…

MALICIOUS

PDF

70.0 KB Created: 2021-02-27 22:45:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 906a4f9fe920e86cd766e0c526981ecf SHA-1: 2dfe66f16d5d6fc2b51e93eb86857f212af161ba SHA-256: b2e64e9b09b6e61c873fc6ab1d6b57084c7d4dfd2c6a68f09818c576cf698b36
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://lozipotod.ru/123?utm_term=finite+element+analysis+course+singapore PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388163/normal_60072aa1419cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423166/normal_5fdb2a0abac99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449395/normal_601d88549aa00.pdfIn PDF document text
    • http://bazubufawe.22web.org/australian_post_annual_report_2018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380530/normal_601869d5caff3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503309/normal_60275f11f0ee0.pdfIn PDF document text
    • https://jazelufum.weebly.com/uploads/1/3/5/9/135965355/13ba9.pdfIn PDF document text
    • https://lilofuzaxodas.weebly.com/uploads/1/3/0/7/130775659/6be507a9.pdfIn PDF document text
    • https://kaxepiset.weebly.com/uploads/1/3/2/7/132740291/e42a35dc306ff.pdfIn PDF document text
    • https://vatifogogunubit.weebly.com/uploads/1/3/4/7/134725392/wuxago_wudifosit.pdfIn PDF document text
    • https://golotelarag.weebly.com/uploads/1/3/1/3/131382536/xewevovow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fabonek.rf.gd/74925214015.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/40502387644.pdfIn PDF document text
    • http://nemebikox.epizy.com/17270352085.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/24496447853.pdfIn PDF document text
    • http://deravamosu.rf.gd/free_android_mobile_spy.pdfIn PDF document text
    • http://rovalonawu.epizy.com/10085545264.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/exerpeutic_400xl_folding_recumbent_bike_canada.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E8 5208 bytes
SHA-256: 0e5ee15fc595b67db49a8dec6739b1f3a9efd47bba6426f6a14979b90a5aa612
font_01_sfnt_off0000d5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F0 5308 bytes
SHA-256: 5e69e62dfae8d66e5b9e48891faf3e9ecd12b4445d0728201aa8562b879a2769
font_02_sfnt_off0000e7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F9 10036 bytes
SHA-256: 9ce13ffafaaac18d203e3e1118ef9baf1c68f7367fb0e72d021581a427dded4a

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