Malicious PDF — malware analysis report

Static analysis result for SHA-256 598385ad3212f1fb…

MALICIOUS

PDF

84.0 KB Created: 2021-06-09 08:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 558064b789a111da715c04cfd40f82bb SHA-1: 68cfd82e94c383fcf3ffe955db35cbf0063925da SHA-256: 598385ad3212f1fbbebf15faabecc77990e91880d8d8d75e94a83e1881290277
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 pointing to PDF files, suggesting a link farm or phishing attempt. The primary URL, 'https://kuzutuzo.ru/123?utm_term=dorset+police+report+a+crime+online', is presented as a way to report a crime, which is a common social engineering tactic. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=dorset+police+report+a+crime+online
    • https://cdn-cms.f-static.net/uploads/4453105/normal_6053e3ddb9ae8.pdf
    • https://cdn-cms.f-static.net/uploads/4454672/normal_600e384d2eab2.pdf
    • https://cdn-cms.f-static.net/uploads/4469119/normal_60264d59dee6f.pdf
    • https://xawizavikerid.weebly.com/uploads/1/3/4/5/134525990/mudovatomewilig-pakogufejef-lokiduwesiv.pdf
    • https://static.s123-cdn-static.com/uploads/4367278/normal_5ff3dfd22d6ea.pdf
    • https://turexebino.weebly.com/uploads/1/3/4/2/134265835/9208469.pdf
    • https://xoxuluxikodo.weebly.com/uploads/1/3/0/8/130814296/7546347.pdf
    • https://static.s123-cdn-static.com/uploads/4466680/normal_6000ea583bdef.pdf
    • https://kurakozizuvev.weebly.com/uploads/1/3/2/6/132681999/jemobed_zidiluvuju.pdf
    • https://bikanagika.weebly.com/uploads/1/3/4/4/134461715/9727324.pdf
    • https://cdn-cms.f-static.net/uploads/4372086/normal_5fd7b7959d056.pdf
    • https://xogepojofaridel.weebly.com/uploads/1/3/2/7/132741214/palasakelunoguluge.pdf
    • https://cdn-cms.f-static.net/uploads/4386363/normal_6062c9a97d90e.pdf
    • https://rofajubufilotol.weebly.com/uploads/1/3/1/3/131384128/58631.pdf
    • https://cdn-cms.f-static.net/uploads/4369309/normal_60134b2a54a0d.pdf
    • https://zufikuwokuz.weebly.com/uploads/1/3/4/5/134522796/2475893.pdf
    • https://static.s123-cdn-static.com/uploads/4424347/normal_5ff62addb3cf7.pdf
    • https://static.s123-cdn-static.com/uploads/4403679/normal_5fee73fe10167.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/66522990-c9bd-4000-a73e-aad55243ab7d/10559748468.pdf
    • https://uploads.strikinglycdn.com/files/405a535f-9943-408b-8621-458c7263c403/60312459247.pdf
    • https://uploads.strikinglycdn.com/files/f1fee6d6-0916-47a6-bb5a-f84b988dde57/lesukexamo.pdf
    • https://uploads.strikinglycdn.com/files/5f72fc9d-72cb-4fc2-8174-ee78f4eead66/how_do_i_write_cancellation_letter.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000118a1.bin
3e52130372be86af9e8e1ff584801c4b703008328dd91fa1af83d08d31784b24
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x118A1 23496 bytes
font_00_sfnt_off0000e179.bin
1520d9b1aa3f594cf0b5954ead38513ed51bf78339cf66a02f7b08a790366efb
pdf-font-stream PDF embedded font (sfnt) at offset 0xE179 5076 bytes
font_01_sfnt_off0000f2aa.bin
a290658ad211f00f72e07aa0032fbb578bfe03dafa46c6d0dc541e7827c3116e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AA 11084 bytes