Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e79785ba7299591…

MALICIOUS

PDF

80.9 KB Created: 2021-05-30 12:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: dadca9517758ed335bf70964effb909a SHA-1: 43702ac53e45cd835032c18c98663e2fd1615d41 SHA-256: 7e79785ba729959126e454b980a50283879004f69d798ae67cc1cedb2e4eaac6
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to obscure the ultimate destination. The embedded content, though heavily obfuscated, appears to be related to driver downloads, a common lure for phishing attacks.

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://soxebez.ru/123?utm_term=bluetooth+driver+for+windows+10+toshiba PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4501514/normal_5ffe289d1b3bb.pdfIn PDF document text
    • https://jubabanijawema.weebly.com/uploads/1/3/1/0/131070146/252855affcd5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483608/normal_603f0b1f0cfab.pdfIn PDF document text
    • https://juromimabosag.weebly.com/uploads/1/3/4/6/134644914/xisotomomoge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417426/normal_606d01767bf02.pdfIn PDF document text
    • https://nazugawexavidi.weebly.com/uploads/1/3/4/6/134678572/1438088.pdfIn PDF document text
    • https://xanodupujariris.weebly.com/uploads/1/3/0/9/130969381/43ae5b2b35f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368740/normal_6053e0a1d5285.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408863/normal_5fe154d1e0c2d.pdfIn PDF document text
    • https://fekolulowezomo.weebly.com/uploads/1/3/4/5/134593542/4b5cfa51661bd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490369/normal_6020c4e5bf8dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383321/normal_601ce76e8f248.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476421/normal_600e43cdb2ab3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474170/normal_6052d9e507fed.pdfIn PDF document text
    • https://wijejotuxaketuv.weebly.com/uploads/1/3/4/3/134338978/7aa0b98ff4be.pdfIn PDF document text
    • https://joxunirefebemi.weebly.com/uploads/1/3/4/3/134319414/lotasudi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373757/normal_60039a28aea22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483855/normal_60288f1f5a194.pdfIn PDF document text
    • https://jepololazatozuj.weebly.com/uploads/1/3/4/6/134601538/buwegigoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/57afdeef-bf54-45ac-93f2-f7ba4c48379c/wederomowiwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e719955-dcf3-4d73-9ea4-56cd20341f6a/revolico_santa_clara_motos_electricas.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_off0000f00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00A 5532 bytes
SHA-256: 40894cd1b488771809de34466a462e10a29201b816609d1e29ee77584368623d
font_01_sfnt_off000102ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EE 22708 bytes
SHA-256: 7271cfb075467a3729c015d3e4c9a9903d7ae0dd00e023423f67fca694743693