Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5198f2ac50e29f5…

MALICIOUS

PDF

79.7 KB Created: 2021-05-31 15:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 615da913335cf6386fd31c06f9f1e0a3 SHA-1: 11e622cf05b3368f6667fbf01a920e5b3675ab52 SHA-256: c5198f2ac50e29f555a49d299dc443b04b733c3719396f994d21da8672ecf2e8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL leading to 'irlanc.ru/pbw' which is presented as a search result for 'personal investment plan'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The PDF structure and embedded links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://irlanc.ru/pbw?utm_term=what+is+personal+investment+plan
    • https://static.s123-cdn-static.com/uploads/4449170/normal_5ffb8b166feff.pdf
    • https://static.s123-cdn-static.com/uploads/4418368/normal_5fdfbc2771e11.pdf
    • https://gilamasizate.weebly.com/uploads/1/3/0/7/130775108/1532779.pdf
    • https://xetomulezaze.weebly.com/uploads/1/3/0/9/130969551/84fb311cd95acf.pdf
    • https://cdn-cms.f-static.net/uploads/4472783/normal_6013e8f5df7fd.pdf
    • https://cdn-cms.f-static.net/uploads/4475985/normal_605c97c084712.pdf
    • https://vimujagu.weebly.com/uploads/1/3/4/3/134306096/nasudok.pdf
    • https://ratipixudaxixix.weebly.com/uploads/1/3/4/4/134472160/nogudifives.pdf
    • https://static.s123-cdn-static.com/uploads/4454171/normal_6002862574ad5.pdf
    • https://kezidixujaroko.weebly.com/uploads/1/3/4/0/134040737/a4337ed9c63.pdf
    • https://cdn-cms.f-static.net/uploads/4447107/normal_6024abc918ee8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a97d5ce9-bd75-45ae-823f-46d44808d89b/78061451131.pdf
    • https://uploads.strikinglycdn.com/files/aa1b6e2b-dff1-4b22-918c-26f277a5c09e/tatulud.pdf
    • https://uploads.strikinglycdn.com/files/bed8ae7f-3313-49f7-a01e-53dccd81a513/sony_str-dn850_bluetooth_pairing.pdf
    • https://uploads.strikinglycdn.com/files/36514667-0351-4c22-b5e7-64aa57421b7a/economic_theory_of_entrepreneurship_wikipedia.pdf
    • https://uploads.strikinglycdn.com/files/32cdcb4f-5bc7-4fb5-a1ea-ce234a2a8c27/the_summer_i_turned_pretty_book_2.pdf
    • https://uploads.strikinglycdn.com/files/e5e37b3f-6e49-4b19-b9ff-f73f14114677/personal_development_plan_examples_for_executives.pdf
    • https://uploads.strikinglycdn.com/files/af441ecd-e607-4e7f-a1e4-7898f890c064/fabubaronasi.pdf
    • https://uploads.strikinglycdn.com/files/76b0bac9-e035-4efa-9eee-2e2a3645a1e1/lg_g_pad_7.0_case.pdf
    • https://uploads.strikinglycdn.com/files/1a23de7b-0827-41a2-8c35-69277793b57b/65328215740.pdf
    • https://uploads.strikinglycdn.com/files/d2a4e10c-ca78-45db-8090-b0b6f0bfa51b/does_baby_vicks_work_for_stuffy_nose.pdf
    • https://uploads.strikinglycdn.com/files/b2e95ded-73fd-4145-9c34-2803ded856a6/latijezovizexiritod.pdf
    • https://uploads.strikinglycdn.com/files/7d968ceb-7bd2-4bab-addc-f11f052d7af4/marionettes_inc_movie.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f76d.bin
e1916c7d562ac11cac1a258ddc56fb77d96d6593ae88338ba05f69c71a5e0c02
pdf-font-stream PDF embedded font (sfnt) at offset 0xF76D 5132 bytes
font_01_sfnt_off000108c9.bin
ac8c9c92795f9ad85794da4d7222a5c5e8cc8e8f4fec1966cb6c09fc56704398
pdf-font-stream PDF embedded font (sfnt) at offset 0x108C9 11492 bytes