Malicious PDF — malware analysis report

Static analysis result for SHA-256 b422dbaf41692b4e…

MALICIOUS

PDF

107.8 KB Created: 2021-02-27 06:44:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 867f70a9c935e50606f1d0b57130aeca SHA-1: 728d0931bc6e0206b0d6f757fe34b9b266a18b06 SHA-256: b422dbaf41692b4ee3bf6bebcdbb2377b77fe0513874d34eb438caaa3f503ac8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the PDF structure itself is the vector for directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/123?utm_term=humayun+ahmed+himu+book+list PDF link annotation
    • http://medicinfo.online/masesugatumigina6z.pdfIn PDF document text
    • https://cdn.sqhk.co/kajurineg/ieygBhf/wolf_wallpaper_4k_free_download.pdfIn PDF document text
    • http://crawlmqyu.space/anarchy_online_leveling_guide_2020iabq5.pdfIn PDF document text
    • https://cdn.sqhk.co/vasegodesazu/fhfgdie/39002830225.pdfIn PDF document text
    • https://cdn.sqhk.co/sujubowip/fVoPjcm/fancy_pants_adventure_world_1_remix_poki.pdfIn PDF document text
    • https://cdn.sqhk.co/lusoxepero/hfjcdhd/5589224114.pdfIn PDF document text
    • https://cdn.sqhk.co/somisafeg/ifgcKII/20449305299.pdfIn PDF document text
    • https://vebavorosufate.weebly.com/uploads/1/3/4/7/134742301/sazajefulolumu.pdfIn PDF document text
    • http://naturfresh.space/26630225292mngwu.pdfIn PDF document text
    • https://rebijigubewu.weebly.com/uploads/1/3/4/7/134770847/9079316.pdfIn PDF document text
    • https://cdn.sqhk.co/suxupijisajo/hAhbuV2/vemesexel.pdfIn PDF document text
    • https://cdn.sqhk.co/rasidepad/Ohcd9Vp/pafawuwimezezew.pdfIn PDF document text
    • https://felinabaf.weebly.com/uploads/1/3/4/3/134380667/1ff00ea6761c471.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lexituvom.epizy.com/example_of_external_css_stylesheet_code.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4F 5236 bytes
SHA-256: 1ed0a172f82b1160636f710774edb2f8aa30490b97968a4c72625f57c4020b1a
font_01_sfnt_off000150f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150F1 14144 bytes
SHA-256: 3415c7baebd71dd90f873c3d8bf4d87ee8e7ad20138cd068335e67e2505a97d5
font_02_sfnt_off00017d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D19 10932 bytes
SHA-256: 0b41785b941c30053dfaa4959087e7c036afee89568a215fb66add70233a020b

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