Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9957ff12c7eb0b4…

MALICIOUS

PDF

85.9 KB Created: 2021-03-27 23:41:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d1d4afd817b4f8c6b564d7ec92f3820f SHA-1: a25b1c170907946460b3bd3434c2fd6108ca4186 SHA-256: b9957ff12c7eb0b493379da0e18455d171eb0837ea6b53166e216658a8acb135
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 benign-looking documents, but one key URL points to a suspicious domain. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document is designed to drive traffic to external sites.

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://xezojetit.ru/aws?utm_term=ap+english+language+and+composition+practice+exam+multiple+choice+answers PDF link annotation
    • http://palopepidek.mypressonline.com/the_story_of_the_human_body_chapter_summary.pdfIn PDF document text
    • https://nonovobuzodeku.weebly.com/uploads/1/3/5/3/135348203/redukemap.pdfIn PDF document text
    • http://xivekoto.medianewsonline.com/agamenon_esquilo.pdfIn PDF document text
    • http://vigirorimikana.medianewsonline.com/al_quran_indonesia_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383692/normal_6008fce5264b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408589/normal_6041ce7d09052.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412767/normal_6054b18a39919.pdfIn PDF document text
    • https://xovobinawulum.weebly.com/uploads/1/3/4/8/134883327/37b3d3e1f8.pdfIn PDF document text
    • http://zujadise.scienceontheweb.net/public_finance_and_public_policy_6th_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459324/normal_601c8bd52eaea.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://083189c9-8220-4687-a375-57be19a37228.filesusr.com/ugd/909b15_81ab0fa1ac7c43c78039af830313a322.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/limewub/scratch_2_for_ipad.pdfIn PDF document text
    • https://s3.amazonaws.com/lopeteb/how_the_grinch_stole_christmas_words_to_describe_the_grinch.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/ejemplo_informe_descriptivo_preescolar.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/fadalowej.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/limulonoxototujunofip.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/20189756718.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/facebook_analytics_android_tutorial.pdfIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_8cc684a9628545558e0b060a9219ef6e.pdf?index=trueIn 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_off000103ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EC 5516 bytes
SHA-256: de11f808d3373ec6dd5ffcf8f8eea253e996e0a6dab4b48451265c8da5b73fd2
font_01_sfnt_off0001168c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168C 10748 bytes
SHA-256: 9e0ff6766ae534ce1685d4fd174c4ac446f0a0541947a5869318970d3218d223
font_02_sfnt_off00013b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B19 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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