Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0e2e19aab558c09…

MALICIOUS

PDF

80.9 KB Created: 2021-04-22 19:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e6fa80e545fd713d3840ed3330386fe1 SHA-1: 73191e6975847f36da03a2a1732266c5853a96a9 SHA-256: e0e2e19aab558c097fa94af130619a0d1a93160160effb7f28c8d4814208c323
186 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing a large number of external links pointing to various domains, many of which appear to be disposable or low-reputation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the sheer volume of outbound links suggests a tactic to lure users to external sites.

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
  • 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://botokaw.ru/strik?utm_term=dyson+dc44+type+b+battery+replacement PDF link annotation
    • http://mitedujonajezed.scienceontheweb.net/gse_algebra_1_unit_1_relationships_between_quantities_and_expressions_study_guide.pdfIn PDF document text
    • https://zoforute.weebly.com/uploads/1/3/4/3/134352948/bosejila-vomosel.pdfIn PDF document text
    • https://jinikegubu.weebly.com/uploads/1/3/4/8/134873825/122163.pdfIn PDF document text
    • https://rebafanivine.weebly.com/uploads/1/3/6/0/136054257/gisasavaguluzuvulow.pdfIn PDF document text
    • https://burerekubexu.weebly.com/uploads/1/3/1/3/131381452/govojipetidut.pdfIn PDF document text
    • https://sumulepali.weebly.com/uploads/1/3/4/8/134882140/koxolafutosesu-bolipaxuxat-damelevedusuxe-lujobuka.pdfIn PDF document text
    • http://dabukim.mygamesonline.org/samsung_un65ju6500f_specs.pdfIn PDF document text
    • https://gitizurozid.weebly.com/uploads/1/3/0/7/130775734/ccf795623bc54.pdfIn PDF document text
    • http://pelinebaj.mypressonline.com/animals_worksheets_grade_2.pdfIn PDF document text
    • http://samafutanub.mypressonline.com/77781170909.pdfIn PDF document text
    • https://vebexedupatad.weebly.com/uploads/1/3/2/7/132740253/fenesezek_tubareto_resuwufufimoz.pdfIn PDF document text
    • https://vobasonuniba.weebly.com/uploads/1/3/4/6/134668907/d6b3be60495b.pdfIn PDF document text
    • https://puxusatorujebi.weebly.com/uploads/1/3/4/7/134749887/7431980.pdfIn PDF document text
    • https://labekefetimobu.weebly.com/uploads/1/3/0/7/130739294/wapivugoxa.pdfIn PDF document text
    • https://sokezimipadivob.weebly.com/uploads/1/3/5/9/135959039/715e66743b44f8c.pdfIn PDF document text
    • https://nabujoxosujegim.weebly.com/uploads/1/3/5/9/135958809/kejilaxet_zadobiwukegiti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fokapikow/2088071996.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/12224816982.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/honeywell_home_rth6580wf_installation_manual.pdfIn PDF document text
    • http://kuwijiti.myartsonline.com/rumawodutumafuzaxosodo.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/23911879158.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93eb751e-c271-434c-90e3-a05f2f345366/82780004805.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b7fc257-5aba-488f-b5da-b87fa01e55d4/british_literature_textbook_high_school.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/52922163065.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_off0000feb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB8 5548 bytes
SHA-256: ba3dd23b5e4c7c591a0319bdb8307ed55332ed5f7714d42f4aa7b73c754ca86b
font_01_sfnt_off00011190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11190 10668 bytes
SHA-256: 17db4a46b72cd20380e3ff181fbd3c17230b3c12304f64008a05e3ac926b4a7b