Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f1a405e6e75bd2…

MALICIOUS

PDF

87.5 KB Created: 2021-05-29 09:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 033a611aaf4f936fb2454fbc1ea895d2 SHA-1: 6df30c3d47e00f3a8823733ed93d4fc9005d79af SHA-256: 90f1a405e6e75bd22016ea6f2a7594a8345bdc33f8d61392e04087b70b99fa21
244 Risk Score

Malware Insights

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

This PDF file contains a large number of links to external PDFs hosted on various disposable domains, indicating a link farm designed to manipulate search engine results or direct users to malicious content. One critical heuristic identified a link to known malicious redirector infrastructure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wb?keyword=hp%20probook%206470b%20price%20in%20bd In PDF document text
    • https://static.s123-cdn-static.com/uploads/4481406/normal_5fc639ff326b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454545/normal_6045efd5a5f60.pdfIn PDF document text
    • https://makaxifosezopuv.weebly.com/uploads/1/3/4/5/134511124/6f9867b521f.pdfIn PDF document text
    • https://jusemeki.weebly.com/uploads/1/3/4/5/134506960/moxakelek.pdfIn PDF document text
    • https://jedunaxalow.weebly.com/uploads/1/3/1/6/131606453/xaseximo-belidupebowegux.pdfIn PDF document text
    • https://ruwofemenir.weebly.com/uploads/1/3/4/0/134040866/571c6660.pdfIn PDF document text
    • https://likotemeg.weebly.com/uploads/1/3/4/4/134464786/borajukupezuzun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413455/normal_604cfc8368b57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487647/normal_604404ac21b4b.pdfIn PDF document text
    • https://xavubetikobu.weebly.com/uploads/1/3/4/4/134474291/bodiwerofut.pdfIn PDF document text
    • https://legunumazonum.weebly.com/uploads/1/3/4/4/134455594/kijogoxivawuxat.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4413850/normal_60afe86c37536.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475392/normal_603cf283e2dc9.pdfIn PDF document text
    • https://setowunujabid.weebly.com/uploads/1/3/4/0/134095848/kepobowize.pdfIn PDF document text
    • https://pafirovax.weebly.com/uploads/1/3/4/6/134662293/3d0d053.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454163/normal_5fd8eedc39bb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384167/normal_603bb16ed052e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471723/normal_5ff324bdb4a72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383586/normal_604e54412e0ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425910/normal_602a97f8e8b0b.pdfIn PDF document text
    • https://nejalebemenogun.weebly.com/uploads/1/3/1/0/131070187/suvewepa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459645/normal_6064b111e3091.pdfIn PDF document text
    • https://pabelazulutibus.weebly.com/uploads/1/3/1/0/131070827/danonarovuvugefi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED20 5276 bytes
SHA-256: 2c23b5d15325a04baf42ae87259a49f436e6741deafb567a52cd2e53e28d9ce7
font_01_sfnt_off0000ff29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF29 3880 bytes
SHA-256: 11b92868c51bff8266e9987c8487468ddbd447eb1746066e634f88eeffd15360
font_02_sfnt_off00010b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4C 11612 bytes
SHA-256: 97acf46a245c620b57c0efc2d377b6f86c304eecaa7e1c0ae5fda50c69abf4f4
font_03_sfnt_off00013280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13280 9056 bytes
SHA-256: 9e7970d6c8f716fc0036e5c4e2163fccd29670415e152b9a46412030d3c8366a

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