Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fee5f56757f20cb…

MALICIOUS

PDF

76.9 KB Created: 2021-04-30 18:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: c6edefbe20b89d8e6572ab6356367cc4 SHA-1: 2ee190e0468bfe385ef12abe07e81df546e8142d SHA-256: 7fee5f56757f20cb10f4f35632cc7f873aeec4efcae471f9a97b7e96ed1d5c4e
284 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable hosting services and redirectors. The heuristic firings indicate it is a malicious redirector and a link farm, likely designed to distribute malware or phish for credentials. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/strik?utm_term=sketchup+8+free+download+64+bit In PDF document text
    • https://xedububedopo.weebly.com/uploads/1/3/0/7/130740082/zipadafog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388818/normal_5fd91601e780b.pdfIn PDF document text
    • https://jabevemejo.weebly.com/uploads/1/3/1/4/131483275/3036448.pdfIn PDF document text
    • https://jaxevilin.weebly.com/uploads/1/3/1/6/131606955/e1977d24e.pdfIn PDF document text
    • https://gopebuxagofu.weebly.com/uploads/1/3/2/6/132681698/kuvitumixilogak.pdfIn PDF document text
    • https://lojijuzirikoza.weebly.com/uploads/1/3/4/5/134593465/7461845.pdfIn PDF document text
    • https://noxesole.weebly.com/uploads/1/3/4/6/134615833/jijokodive.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452199/normal_5ff9fe422c782.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448539/normal_6038d7a4729fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416154/normal_600d0507b0e3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460072/normal_604800b5955f8.pdfIn PDF document text
    • https://pumaxodevuk.weebly.com/uploads/1/3/1/8/131872084/c3a84.pdfIn PDF document text
    • https://tovunebutulewe.weebly.com/uploads/1/3/1/8/131871744/54aa1ae91ac88a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468534/normal_600a259d3c231.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414159/normal_6058642242b59.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443578/normal_5ff0a80623ab9.pdfIn PDF document text
    • https://zegepami.weebly.com/uploads/1/3/0/8/130874110/mujow.pdfIn PDF document text
    • https://lidalukedewad.weebly.com/uploads/1/3/4/6/134664428/6154469.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wozawexopad.epizy.com/istqb_mock_test_chapter_1_with_answers.pdfIn PDF document text
    • http://ranovisodada.epizy.com/playstation_2_emulator_games_free.pdfIn PDF document text
    • http://mijojora.rf.gd/who_started_codependents_anonymous.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_off0000ec58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC58 5900 bytes
SHA-256: a2e2cb960b59b43bc98a04bec498bb2f7d910c2128a33a4dcf6185859b85a44e
font_01_sfnt_off00010086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10086 11064 bytes
SHA-256: 8a03de9bd9e202a2977d5a8cf58ecb04ffacb4b9c6c8ba86f568f694325bd866