Malicious PDF — malware analysis report

Static analysis result for SHA-256 d22141de7fa6f47b…

MALICIOUS

PDF

82.5 KB Created: 2021-02-20 12:54:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a7a5c25c0fd5e9cbddfaf8aabbbdc66f SHA-1: c6b6174dcb5934c4550125d5e9a5983f35f248bb SHA-256: d22141de7fa6f47bdf45bf337e4bede93de61cce6b448a95e8a38511f51c581e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on S3 buckets and Weebly domains, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jacksth.ru/123?utm_term=social+media+graduate+jobs+london PDF link annotation
    • https://zojegidaluvimov.weebly.com/uploads/1/3/4/1/134109086/5ecfbb.pdfIn PDF document text
    • http://opit.space/kisigojovugadinifowejozo12b05.pdfIn PDF document text
    • https://dipabuxirakilat.weebly.com/uploads/1/3/1/0/131071076/6907060ec4.pdfIn PDF document text
    • https://wakebanimoxebej.weebly.com/uploads/1/3/1/3/131383753/zuwemikel.pdfIn PDF document text
    • https://xetiwokew.weebly.com/uploads/1/3/4/7/134741649/2077900.pdfIn PDF document text
    • https://cdn.sqhk.co/dopuwene/nohjq6E/dejewavugubapofosugo.pdfIn PDF document text
    • http://reduslim-italia.website/18393345974hrz7t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jemazejodep/53925240805.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/monthly_accomplishment_report_sample_for_ojt.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/88919178909.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/wisokuxof.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/gipilozopamafesitokowa.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/ripafemavuwopijukofute.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/teri_meri_ankahi_dastan.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/courier_tracking_number_formats_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromisixinolib/72415306959.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70C 5460 bytes
SHA-256: 71e67971d9cb2c96e234fd4247d9020e0ff30ceec5b7fd3d6cab3a146eb8e8bf
font_01_sfnt_off00010973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10973 10916 bytes
SHA-256: bade1e8d4346da1df2d1892ed02fa31c3afae5d26b45c9addd74511021c5a866
font_02_sfnt_off00012eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB6 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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