Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec7f9aabba03fd0d…

MALICIOUS

PDF

76.2 KB Created: 2021-03-09 02:40:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 0828d65e9d73c2efcf1a5457f3094eb4 SHA-1: 11b88b0e86d5457dfc6e8c78a82e7abeac84c506 SHA-256: ec7f9aabba03fd0de4ed426bcdb14d145f7f81e685a61eb0faf874b0ce240fa9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are generated SEO-style links, indicating a link farm or SEO poisoning attempt. One prominent URL, 'https://leonvi.ru/strik?utm_term=why+is+my+lg+gas+dryer+not+getting+hot', is embedded in the document body and appears to be a lure. ClamAV detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', and an ML classifier also flagged it as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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/strik?utm_term=why+is+my+lg+gas+dryer+not+getting+hot PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4376371/normal_5ff86ae23a7af.pdfIn PDF document text
    • https://sawinabepetejex.weebly.com/uploads/1/3/4/7/134714359/2419950.pdfIn PDF document text
    • https://lujoduxatodovaw.weebly.com/uploads/1/3/2/3/132302833/kajewotufumudaf.pdfIn PDF document text
    • https://gifenatewa.weebly.com/uploads/1/3/4/4/134480542/letixenusowelop.pdfIn PDF document text
    • https://rogusavonovupe.weebly.com/uploads/1/3/3/9/133997589/mafulirubesoribox.pdfIn PDF document text
    • https://papokerudinex.weebly.com/uploads/1/3/4/3/134310480/6054212.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405459/normal_5fcf1990512bb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sisaxu/los_conectores_en_espaol_ejercicios.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/flight_simulator_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1c9455c-cb08-40ca-847d-e810c6e29bf3/38558836490.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/english_album_songs_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/amulet_book_7_free.pdfIn PDF document text
    • https://b564fea6-732e-489f-a029-a72dc6590de2.filesusr.com/ugd/6a4619_0388f382392345d49c0129e66c7e59b8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xesigeze/how_to_get_electric_stove_drip_pans_clean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e04e2044-b3d3-4df2-ac2d-92773dfc26c3/zavewegaxagipez.pdfIn PDF document text
    • https://d497f082-4895-42de-a72c-038d9367c8a3.filesusr.com/ugd/8e727b_4775676d1b724bcf8f775820a58797d5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/lepunurituvisiv.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/baduta.pdfIn PDF document text
    • https://ecfc1f44-6648-4072-bff5-6ee4adcfbe4f.filesusr.com/ugd/e5a943_844d8ec7616d48938f478f1dd854f560.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/vadekig.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_off0000ec16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC16 5352 bytes
SHA-256: 32547bf280cac777a33aa20b9e1f1e44f8ac1e7236e46d1c8f76bd2a20d80ee0
font_01_sfnt_off0000fe32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE32 11000 bytes
SHA-256: 728e677436d968aeffb47dc62187b049a1242ef529d1ee6ab81951c80ca508c9

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