Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e7ea6de7ba0da43…

MALICIOUS

PDF

72.6 KB Created: 2021-02-06 18:23:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 232dd5e9269704d00eb200930951c00c SHA-1: 3e5be62fe38765b261c3e8e2ab950e66522aa369 SHA-256: 5e7ea6de7ba0da43b82e29b01c9dd74e905802cd2a673820ca1b38d0a68cfa09
186 Risk Score

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 0.9997

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://leonvi.ru/aws?utm_term=carbocation+and+carbanion+stability+pdf PDF link annotation
    • https://jotulamopusojo.weebly.com/uploads/1/3/4/4/134465369/02ca8eb50f8716b.pdfIn PDF document text
    • https://cdn.sqhk.co/bogulevim/Ljihiid/77634003842.pdfIn PDF document text
    • https://tagakokiginozol.weebly.com/uploads/1/3/0/7/130775172/0c78312c2463.pdfIn PDF document text
    • https://fejoburu.weebly.com/uploads/1/3/0/8/130813906/01781367.pdfIn PDF document text
    • https://cdn.sqhk.co/xolafunodo/moddhd5/bataille_de_la_marne_1914_taxis.pdfIn PDF document text
    • http://mekozeka.66ghz.com/1570372193.pdfIn PDF document text
    • http://mihetos.xyz/koxunegowujoneravariwegogom09b.pdfIn PDF document text
    • http://atlas-copco.su/al_kitaab_part_2_2nd_edition_answer_keyq7ql3.pdfIn PDF document text
    • https://pifujikis.weebly.com/uploads/1/3/4/8/134875168/tonopalofanumovoz.pdfIn PDF document text
    • https://bumobuzeki.weebly.com/uploads/1/3/4/4/134477779/ludukipibumovojanid.pdfIn PDF document text
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/fofabokenu-gumajolen-wudujiw.pdfIn PDF document text
    • https://mujebaroso.weebly.com/uploads/1/3/4/1/134131407/xexetetukirubozelaf.pdfIn PDF document text
    • https://tigidejuremu.weebly.com/uploads/1/3/4/5/134502839/d00d58b45ea1.pdfIn PDF document text
    • http://dkblogin-de.com/rust_bucket_helmet_vs_coffee_canyfl77.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kebanibaru.epizy.com/my_breakup_diary_images.pdfIn PDF document text
    • http://mudozegiviw.epizy.com/dosurijidubore.pdfIn PDF document text
    • http://pejulok.epizy.com/zejaximega.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_off0000dec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC7 5296 bytes
SHA-256: cb0f073d4ebb69f8dc89626643ed943f8bc52b32eb264cee7ed2ae5ad62b1e20
font_01_sfnt_off0000f0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D7 10748 bytes
SHA-256: 2e908a58d99f86cd673847b740debcf60f2b5548c2e7430ae2c32e44de440cdd

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