Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa1f98d09aa2a4cb…

MALICIOUS

PDF

73.1 KB Created: 2021-02-16 08:49:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7187a3e4ab8081f8f0f0ba9989f897e5 SHA-1: ead24fe1a3a738f1e588dad55c3b744c8fc52145 SHA-256: aa1f98d09aa2a4cbabc15b459f9f31033979fecc484db7a5b66efb1eea2a790a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to other PDFs, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV both strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The embedded URLs are likely used to redirect users to malicious sites or download further payloads.

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://druttle.ru/strik?utm_term=the+girl+with+the+dragon+tattoo+trilogy+book+review PDF link annotation
    • https://bitoxogosem.weebly.com/uploads/1/3/4/3/134386372/polasaxozar-lideg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474449/normal_6024860d80c82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480886/normal_5fda30f0efb33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388037/normal_5fda4188cd67a.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/eggjbjb/stack_race_3d_printer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378848/normal_5fcf49c901a36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478127/normal_600b6679ad218.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490950/normal_5fdf920017397.pdfIn PDF document text
    • https://cdn.sqhk.co/daruluneti/ujijdia/664560160.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419822/normal_6026668d8e104.pdfIn PDF document text
    • https://cdn.sqhk.co/zegetaru/efwia06/nickelodeon_kart_racers_2_grand_prix_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/gghhif2/bus_simulator_free_download_for_windows_8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371812/normal_5ffa437f3e7ce.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/tjc95je/tegosezexosimilugofodu.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/hg8Whbh/6940017718.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/vojapu/94322679152.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/77924194069.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/52066651880.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/kojitowu.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_off0000e24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24B 5316 bytes
SHA-256: 3bfba34aa1b998e22c4ba8d3d8b56160fe467b05d54f4d19bb0a303750396f94
font_01_sfnt_off0000f476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF476 10136 bytes
SHA-256: 68b44c3e0a3513885027c092574316dbc7726f8fb18cbbfda454ba2d18706dee

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