Malicious PDF — malware analysis report

Static analysis result for SHA-256 820de1a018afae87…

MALICIOUS

PDF

76.3 KB Created: 2021-05-24 05:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 951b2d2824a336d90070aae8a00da7d7 SHA-1: 7b38ec4603d9b132ac0387ce0c51160f952602a7 SHA-256: 820de1a018afae87894faf4e9092e1fcb2359fa31a46e893dcba8edf0d0975fa
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to a NASA worksheet. The presence of a PDF link farm heuristic indicates a large number of outbound links, likely for SEO manipulation or to distribute malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=nasa%2527s+video+tour+of+the+electromagnetic+spectrum+worksheet In PDF document text
    • https://befawiboper.weebly.com/uploads/1/3/5/3/135389238/jupawodu.pdfIn PDF document text
    • https://seririgikum.weebly.com/uploads/1/3/0/7/130739922/xoxogukojemu.pdfIn PDF document text
    • https://vawosikajoj.weebly.com/uploads/1/3/1/4/131438279/2ffc5e5d860c623.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474206/normal_60185c0494526.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460471/normal_606b18c162fd6.pdfIn PDF document text
    • https://vedemolo.weebly.com/uploads/1/3/4/7/134702866/918365.pdfIn PDF document text
    • https://bowolaje.weebly.com/uploads/1/3/1/6/131636675/4a7118827e.pdfIn PDF document text
    • https://sizuginoten.weebly.com/uploads/1/3/4/4/134490660/7a76deba81f.pdfIn PDF document text
    • https://darifojiwuz.weebly.com/uploads/1/3/4/5/134588766/ledefafokasik-pirinef-puramepivufijev.pdfIn PDF document text
    • https://koludoselutak.weebly.com/uploads/1/3/4/8/134893798/waguvekokokikap-kexedibedowixe-tozabajadonar-roberurameke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef1ec87d-3f82-40ca-8ee1-a95fc267e498/folebuvogeviviwefuf.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/silicone_rubber_sheet_manufacturers_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/caravan_drum_sheet_music_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc400421-6d1a-4701-9579-dcac11db2a64/47151831708.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/19082708403.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/52526285165.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/99_names_of_allah_printable_sheet_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/call_of_duty_4_ps4.pdfIn PDF document text
    • https://s3.amazonaws.com/kubedukowug/64262343340.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/83029580272.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0ba7702-0193-41e4-8dbb-7f62f38d8f48/nikuluxuzufarigusax.pdfIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/xoralozazawinepomidoze.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/valentine_s_day_movie_free_2010.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_off0000e97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97E 5788 bytes
SHA-256: 7aac216450f6e4945747224d08b396dbb97e6734c7070af67e3995a0fc83340b
font_01_sfnt_off0000fd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD26 10560 bytes
SHA-256: 34a3afd0264fae2ec926759d57139f4b60b6e43a8be1caa8e0029444a09ca140

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