Malicious PDF — malware analysis report

Static analysis result for SHA-256 456856cccc57b6c2…

MALICIOUS

PDF

73.9 KB Created: 2021-02-24 11:28:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: a860e480ee82ccb7a242ef7b3ca81200 SHA-1: 4300411c1ccd74e40446e0061407726b561290f8 SHA-256: 456856cccc57b6c2e0758b4c2c2a4a4ae200b18185910651b71002d1c3c324d2
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this. While no scripts were explicitly extracted, the nature of the PDF and its numerous external links suggest it could be used to redirect users to malicious sites or phishing pages.

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://seumenha.ru/wix?keyword=topographic+map+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421333/normal_6029e6dc5bc87.pdfIn PDF document text
    • https://wipiwabe.weebly.com/uploads/1/3/4/4/134438476/fusulapebiji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443588/normal_5feb204d39f70.pdfIn PDF document text
    • https://cdn.sqhk.co/zebimapajod/AYieiaq/75285690138.pdfIn PDF document text
    • https://cdn.sqhk.co/feletitami/Cghhhje/lezan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390057/normal_60067acec216e.pdfIn PDF document text
    • http://bogavevi.22web.org/14281111233.pdfIn PDF document text
    • https://basosogufu.weebly.com/uploads/1/3/4/6/134682995/7195755.pdfIn PDF document text
    • https://fefugenaxidoseb.weebly.com/uploads/1/3/1/3/131380158/naputovebokixilon.pdfIn PDF document text
    • http://xorelurisadadun.iblogger.org/best_android_phone_rooting_apps.pdfIn PDF document text
    • https://libotavod.weebly.com/uploads/1/3/0/8/130813055/1405d.pdfIn PDF document text
    • https://jupavovol.weebly.com/uploads/1/3/4/3/134314217/kutad_danof_vurimimaku_lowukeze.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/hihjicQ/37756246854.pdfIn PDF document text
    • https://gomosonu.weebly.com/uploads/1/3/2/7/132712120/disisulisudok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467564/normal_6025514533824.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386618/normal_601c8809c6d98.pdfIn PDF document text
    • https://vepoxiwoja.weebly.com/uploads/1/3/1/1/131164136/1422304.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://numowun.rf.gd/69750527065.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_off0000e5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C5 5420 bytes
SHA-256: 1de21896f32f182077ba22e67ae05aa05225aeea368757de3a93c189cab2ef15
font_01_sfnt_off0000f823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF823 10116 bytes
SHA-256: 3d73490ac623f51adace5c7dccf14704c3b1b30aa94aa893f7d2d06d1d00b9a9

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