Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc51fb6e42feeac…

MALICIOUS

PDF

76.3 KB Created: 2021-04-11 02:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e960af998daa732ad256b6605dd874b3 SHA-1: 53b79fd1a4ed771d1a0e6b74ff56068c33fe25a6 SHA-256: 9fc51fb6e42feeac3209bc3eb29991a825c63bc13d994c2092a857e6df0b7fc8
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 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=sandisk+clip+sport+reviews PDF link annotation
    • https://gowigejovijori.weebly.com/uploads/1/3/0/7/130740297/xosogurutefezo.pdfIn PDF document text
    • https://lonamoki.weebly.com/uploads/1/3/5/9/135964194/fixijuronolurapoji.pdfIn PDF document text
    • https://todilotifobaw.weebly.com/uploads/1/3/2/7/132712516/3085119.pdfIn PDF document text
    • https://dapodufez.weebly.com/uploads/1/3/3/9/133997146/vovusonijoviduniz.pdfIn PDF document text
    • https://mosugomepa.weebly.com/uploads/1/3/4/0/134096926/fejegupikusomelifir.pdfIn PDF document text
    • http://vosiwikaxipe.22web.org/jinumibux.pdfIn PDF document text
    • https://gotizede.weebly.com/uploads/1/3/2/6/132695714/kigupobawo.pdfIn PDF document text
    • https://gazonigupeti.weebly.com/uploads/1/3/4/8/134879892/ae2fd5.pdfIn PDF document text
    • https://minunelojob.weebly.com/uploads/1/3/1/4/131453060/08c6bc11fc68be0.pdfIn PDF document text
    • https://jibowosiz.weebly.com/uploads/1/3/4/6/134632869/641398e3a9f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_3c4c3f81a4a44e5d94b461e37acfedbd.pdf?index=trueIn PDF document text
    • http://radujexoxetapil.epizy.com/color_by_number_sheets_halloween.pdfIn PDF document text
    • https://8aefc570-8454-48c3-bb63-d4d1067b7ce0.filesusr.com/ugd/5c9621_cc1bb058050b4cadab5c6f7a25a20b4a.pdf?index=trueIn PDF document text
    • https://63a0a607-6d1b-4b95-a813-f1b07cabc719.filesusr.com/ugd/ad56f2_f23d5e6ec6bc4e8a9d4cbbfff3814065.pdf?index=trueIn PDF document text
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_6717bc48868e452a916eb0d8fdd64b66.pdf?index=trueIn PDF document text
    • http://wepaxilex.epizy.com/vipobanaw.pdfIn PDF document text
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_b54ea9966ab24557a38fcea7cf9be27d.pdf?index=trueIn PDF document text
    • https://c9107794-7b31-4e5c-84de-5db174abdfaa.filesusr.com/ugd/aabf5f_586a52e7c135457681b701d7b1512040.pdf?index=trueIn PDF document text
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_02830e60adc54f7e9a91bbc9d51e6c78.pdf?index=trueIn PDF document text
    • https://3a7b682b-4b85-4b21-836a-a34929c8735b.filesusr.com/ugd/0cd3a8_c3b39a4d57b947e99dfc9cc7cb5661ef.pdf?index=trueIn PDF document text
    • http://xupanapil.epizy.com/48690105633.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_off0000de68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE68 5176 bytes
SHA-256: 0a4b68913a26c06c1cadeeeb000b23dd227124b467c172c1541ece3fa2214e37
font_01_sfnt_off0000f011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF011 11056 bytes
SHA-256: c31adf6f06b64393244ecfc2a3c078049f6e9949aec6e2555f3355cbc10ab4ef
font_02_sfnt_off000115ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FF 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3