Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f7d5098a438fa4…

MALICIOUS

PDF

76.3 KB Created: 2021-03-09 08:03:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: aa4994b40a7addec1607087c89368113 SHA-1: 304aba1e8305a165b75f5a6b95d18ae237361dd6 SHA-256: 83f7d5098a438fa405c350a335120a1740bc4348b342495cee65498b3b5e0f55
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it is part of a link farm. The document body, though heavily garbled, contains text suggesting a 'petition for summary administration florida free form', which is likely a lure. The embedded URL points to a site that appears to be part of this link farm, potentially leading to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://nipisod.ru/wb?keyword=petition%20for%20summary%20administration%20florida%20free%20form PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0e627107-309b-4451-a84d-e7064c41fccd.filesusr.com/ugd/04c368_07ff21ed0003495a8b5cf3f9e4df060e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fizaxo/rovenga_aarsh_benipal_song_free.pdfIn PDF document text
    • https://b19b3b79-9ae2-4e99-9b16-ef32671d60f4.filesusr.com/ugd/0bc867_3b86c138aa204bd8b1d2d9d930745bda.pdf?index=trueIn PDF document text
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_d8bd556aa62a48b09704021328557807.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tumuzu/62363865672.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9db14990-0158-408c-b5da-0da17f8502a1/drugs_society_and_human_behavior_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/fast_addition_tricks_in_hindi.pdfIn PDF document text
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_3484266135d744f9bd79600a42f2a06e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/35772815572.pdfIn PDF document text
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_6e3d45daad6b4896ba9033a2f8a9befb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e0ff6f0-dc43-4475-a8bc-34bd006dc424/gujuvozalilipilaziz.pdfIn PDF document text
    • https://e6676b24-921d-4f57-8fca-beda98688f3c.filesusr.com/ugd/144d27_7b2df56227fb4cbb8a139e16e6feb5de.pdf?index=trueIn PDF document text
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_7c0b2c128313444a94ba03115d567fe4.pdf?index=trueIn PDF document text
    • https://0a497e50-07dd-462d-832d-d8678f741a8e.filesusr.com/ugd/5f857b_f5f1b5140eb442d49a6407ad5b66eca0.pdf?index=trueIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_1c9234e37bd54a33bc3e72e9eec14d71.pdf?index=trueIn PDF document text
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_740d97bc311c45fdb45f8cc2c468ddd6.pdf?index=trueIn PDF document text
    • https://e1318bff-d970-45e2-bcea-45481503a18b.filesusr.com/ugd/75a96d_bd4d5bfba9d14320ad55ddbf496bc902.pdf?index=trueIn PDF document text
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_4260bb1e09d8454185917048437c2479.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/atmel_sam3x8e_arm_cortex-_m3_datasheet.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_off0000ee2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2E 5156 bytes
SHA-256: 739e534b80ba454f350ed0ca8eb6e1153bef2048c12ca5c862dfe47b7d7371ce
font_01_sfnt_off0000ffa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA7 10692 bytes
SHA-256: 99970df1a14500a119e24e1b1bb8dac258f96988b67a9945da1b7f86f9b3f31f

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