Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a9cdfb4ec7be206…

MALICIOUS

PDF

81.1 KB Created: 2021-03-24 00:15:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7d0e7775bc8055dce05e577acb9d51ac SHA-1: 2bb246cf97e57ae0ca70b7ff36224699426cf133 SHA-256: 1a9cdfb4ec7be20685bfbcf84a97f0e1aed7df7ecf887c3f7e3782fc0fa30954
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme to facilitate phishing or malware distribution. The embedded URLs are likely used to direct users to malicious sites.

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://seumenha.ru/strik?utm_term=how+to+study+for+nursing+pharmacology+final PDF link annotation
    • http://boziliruzake.22web.org/firinuvi.pdfIn PDF document text
    • https://xaforexu.weebly.com/uploads/1/3/0/7/130775472/852853e9420c2.pdfIn PDF document text
    • http://kellys.space/piludotemubofoxasusawoy9p4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392474/normal_60062d4e50878.pdfIn PDF document text
    • http://nosinoski.shop/goviturakah2hej.pdfIn PDF document text
    • http://nibelv.xyz/14137213625os7i3.pdfIn PDF document text
    • http://magicwoolshop.com/geometry_5-_1_bisectors_of_triangles_answersnie80.pdfIn PDF document text
    • http://solavopuna.22web.org/acoustic_guitar_amplifiers_buying_guide.pdfIn PDF document text
    • https://dadanesikukuno.weebly.com/uploads/1/3/1/4/131438481/xisow-xuxizomofum-domadafijajuwe-dixatoxux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529149/normal_6008219633ed4.pdfIn PDF document text
    • https://pidodogifir.weebly.com/uploads/1/3/1/3/131383649/latofegul-gabidifokar-firiropidimako-gusirorowuve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386094/normal_600d139e0547c.pdfIn PDF document text
    • https://pabidiwamudobav.weebly.com/uploads/1/3/5/2/135299897/1488532a9653966.pdfIn PDF document text
    • https://niridugur.weebly.com/uploads/1/3/5/2/135296669/xefesonomereva_voxedolijudu_tiximuli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6776ac3f-883f-499f-bc52-38dff818ec46.filesusr.com/ugd/969751_9cca14c2c91244bd90fb72f8eb8d03c2.pdf?index=trueIn PDF document text
    • https://8084a2ae-6cfb-493d-8155-0d4219c0f7e3.filesusr.com/ugd/5b3528_c4e137ed2bf24ab5bbbc6f38fbec8200.pdf?index=trueIn PDF document text
    • http://tunawibiga.rf.gd/fowubudezapa.pdfIn PDF document text
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_ff5834e2b4c24f9995689a71674001ee.pdf?index=trueIn PDF document text
    • http://suwifubol.epizy.com/how_to_improve_data_management.pdfIn PDF document text
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_0afb8cfe68e84e93bc2b6cd8fbf31d3e.pdf?index=trueIn PDF document text
    • http://tadiwolavis.epizy.com/25951587495.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_off0000fe1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1D 5724 bytes
SHA-256: ca1729a1fe51afee4162cfd0200c210c1e49ba8c151733a1d50e338fdec17c18
font_01_sfnt_off00011187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11187 11036 bytes
SHA-256: 75f153ee2ab91be8676d1e93933bd6f38730a631069513d10ae4c4f8741e1911