Malicious PDF — malware analysis report

Static analysis result for SHA-256 c10331321bfa2d03…

MALICIOUS

PDF

82.6 KB Created: 2021-02-27 09:02:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 9f838f9a3001b2d5236e8acdf97e8710 SHA-1: 7548a91058dca71d578e664c708bedb176c8fffc SHA-256: c10331321bfa2d03f72c780c0d678e328087da39ed5afc3db5ca452b494d0d5a
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, suggesting a link farm or redirection scheme. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score further indicate malicious intent. The document body, though truncated, contains a search query related to 'how to reset air compressor', which is likely a lure to direct users to malicious sites.

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://soxebez.ru/aws?utm_term=how+to+reset+air+compressor PDF link annotation
    • http://ninavadilu.22web.org/mevufanizufek.pdfIn PDF document text
    • http://ladiluvame.mypressonline.com/jeu_de_carte_32_voyance.pdfIn PDF document text
    • https://cdn.sqhk.co/lakekomum/jZgifRC/81049347338.pdfIn PDF document text
    • http://tafugegajotu.mygamesonline.org/laxonujugozidadaruvibajuj.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/fgiNPhd/house_flipper_vr_oculus_quest.pdfIn PDF document text
    • https://negijozizur.weebly.com/uploads/1/3/0/7/130775009/nofirijadatotem.pdfIn PDF document text
    • https://cdn.sqhk.co/bupitagalir/nMsiaOt/drift_stunt_racing_2019.pdfIn PDF document text
    • https://wewiruvikaju.weebly.com/uploads/1/3/0/7/130775929/3d53f8afdc.pdfIn PDF document text
    • http://gowanenutik.mypressonline.com/55178654068.pdfIn PDF document text
    • https://cdn.sqhk.co/jibezilesu/8mjhIhg/sorusine.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefima/fZJibB0/37737945488.pdfIn PDF document text
    • https://gajuleli.weebly.com/uploads/1/3/1/8/131871701/392124.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nejesezape.myartsonline.com/samsung_note_3_price_in_south_africa.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_off000106cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CB 5100 bytes
SHA-256: 642a517405028c49a17bfaa6aee87d028ef711fcf1357b7e456e24c1319dba66
font_01_sfnt_off0001181c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181C 10968 bytes
SHA-256: 1ecadf2664616dc9fb3e6c7310b76021355d76ce7265ba0b0d4471ca81180186

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