Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f3534d19de6ff2e…

MALICIOUS

PDF

78.1 KB Created: 2021-03-20 18:59:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 41d3d4c6fefdbf73921d84efe783151e SHA-1: b5081fc40c8123a469b2bc4b56ce068ede6a9c39 SHA-256: 1f3534d19de6ff2e274b1c8a06aab098108cd1da22125249c79c0008f70ee073
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links to external PDFs hosted on disposable domains, indicating it functions as a link farm. One critical heuristic identified a link to known malicious redirector infrastructure, and ClamAV detected it as Pdf.Phishing.Trojan. This suggests the document is designed to lure users to malicious sites, likely for phishing or to download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://crophysi.ru/123?utm_term=rpf+ancillary+answer+key+group+c+2019 In PDF document text
    • https://nidabiweni.weebly.com/uploads/1/3/4/8/134865500/gusirob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479213/normal_601b4a7c01207.pdfIn PDF document text
    • https://wezuzasiteva.weebly.com/uploads/1/3/1/3/131397996/5e5402a60ac0f.pdfIn PDF document text
    • https://tedetoxemerul.weebly.com/uploads/1/3/5/3/135311624/9433503.pdfIn PDF document text
    • https://ribafiligizeki.weebly.com/uploads/1/3/1/4/131438260/fddc6ab.pdfIn PDF document text
    • https://sutoxozugunewu.weebly.com/uploads/1/3/4/7/134768558/6018514.pdfIn PDF document text
    • https://cdn.sqhk.co/siduniberame/hehgjhc/hobart_tv_guide_tonight.pdfIn PDF document text
    • https://nebegozanukasaz.weebly.com/uploads/1/3/4/6/134699913/bibuvupisabojok.pdfIn PDF document text
    • https://ropexosuwewi.weebly.com/uploads/1/3/1/3/131380205/pivejapa-vojirodorago-ruwujudutix.pdfIn PDF document text
    • https://cdn.sqhk.co/fetebutujo/bRULphc/lekanuboxevifilavexabiwok.pdfIn PDF document text
    • https://wodumipanopova.weebly.com/uploads/1/3/4/7/134731655/1884132.pdfIn PDF document text
    • https://lefexaro.weebly.com/uploads/1/3/5/3/135324439/468611.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389090/normal_602c58a262253.pdfIn PDF document text
    • https://repugololenip.weebly.com/uploads/1/3/4/8/134880500/4510972.pdfIn PDF document text
    • https://venefosek.weebly.com/uploads/1/3/1/8/131871910/9351358.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379363/normal_5fc799eb6229a.pdfIn PDF document text
    • https://zuxosudeti.weebly.com/uploads/1/3/4/3/134359900/xolikazojejaru.pdfIn PDF document text
    • https://nidegezepon.weebly.com/uploads/1/3/4/6/134650885/d1cce56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366652/normal_5fe427bbb26ac.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/07b2c352-ef57-49f0-a04b-b62c2ca5889e/demonstrative_adjectives_in_spanish_practice_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c94dc3b2-d18f-437b-a624-77dc87d04732/92830336017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0fd4817-cc58-43f3-9063-122da1ff4b77/febavibabadovonegorava.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/524f1e41-a574-4e57-b5ea-1ebf2c5bb849/list_of_iatf_certified_companies_in_india.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_off0000f076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF076 5928 bytes
SHA-256: 324a22eb2c9d01c59cd2aad5bd400b568a9fefc3d18ce77670ea7695180d387f
font_01_sfnt_off000104dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DD 11036 bytes
SHA-256: c01b1037f9c613fa9c6be7d9c9a5c93020689dc5879673745f041f1af3f199a6

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