Malicious PDF — malware analysis report

Static analysis result for SHA-256 11f5f91db0790339…

MALICIOUS

PDF

76.3 KB Created: 2021-02-19 21:15:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a32ee02a101b1eecd817537c354ab954 SHA-1: f57b1997295cf4cdb14d780157471c47cc94044e SHA-256: 11f5f91db079033970c447ad16b4c17be82cb1a65e09a61c26662c8d1936e108
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains or link farms, suggesting a phishing or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wix?keyword=minecraft+1.14+apk+2018 PDF link annotation
    • http://tameenegypt.com/xuvadesepevemuzipusivif2qzpc.pdfIn PDF document text
    • https://regifevadep.weebly.com/uploads/1/3/4/4/134476302/1572564.pdfIn PDF document text
    • http://about-igsupport.com/notufulumufubosibomijetl6kwg.pdfIn PDF document text
    • https://zekigoduse.weebly.com/uploads/1/3/4/3/134336209/538828.pdfIn PDF document text
    • https://vokavubibobudew.weebly.com/uploads/1/3/5/3/135316357/3542812.pdfIn PDF document text
    • http://copyrighytsupport.com/baby_george_foreman_rotisserie_instruction_manualycvgc.pdfIn PDF document text
    • https://fiferogupinuwa.weebly.com/uploads/1/3/5/3/135306016/vufopuvopupajotexape.pdfIn PDF document text
    • http://hookup755.fun/xegatofepegaw3rtri.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/35ad04d.pdfIn PDF document text
    • http://psylath.com/laxerikodoveduwuluxipubadmn27e.pdfIn PDF document text
    • http://yourdesk.website/72881047486cpjnn.pdfIn PDF document text
    • http://funseeds.site/aem_35_8460_manualets5k.pdfIn PDF document text
    • https://vagoledos.weebly.com/uploads/1/3/5/3/135320004/sasakuroli.pdfIn PDF document text
    • https://bufigolumixi.weebly.com/uploads/1/3/4/2/134234787/5e5ffe87e.pdfIn PDF document text
    • https://nojilanoxejajej.weebly.com/uploads/1/3/4/8/134856497/dogolaridoju.pdfIn PDF document text
    • https://vaxurubezinijor.weebly.com/uploads/1/3/4/6/134690270/d379676f74c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C2 5508 bytes
SHA-256: cf77d8cbef7a07b048c6159ef0dd9c4a966bd9b01e017cc9c6e6dd4a1e92e963
font_01_sfnt_off0000f8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AA 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off00010138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10138 10148 bytes
SHA-256: d9f886501edfc4cd4599b1b995d76aa7b49a3c5ab5751cfe865805e925eb6db7

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