Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19d16f85b48efff…

MALICIOUS

PDF

78.6 KB Created: 2021-05-26 10:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79c4b401ab1ecc0a60520ab1530c0fb2 SHA-1: a1af13dae1773d2cb5dc745c8f241c5ca6434012 SHA-256: b19d16f85b48efff6f95b21dec97ce890eaed185359907398ab2568f6051511c
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with the primary malicious URL being dugedepap.ru. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://dugedepap.ru/strik?utm_term=what+is+the+average+salary+of+a+marketing+manager+in+the+uk
    • https://mibujisoj.weebly.com/uploads/1/3/4/5/134525757/c5a9620e535e6fc.pdf
    • https://rigavimiba.weebly.com/uploads/1/3/0/8/130814992/ralanutunem.pdf
    • https://sinosopad.weebly.com/uploads/1/3/4/8/134892142/mumubizofukas_naraburaretaw.pdf
    • https://jovinafunen.weebly.com/uploads/1/3/2/6/132695325/aac74.pdf
    • https://static.s123-cdn-static.com/uploads/4453741/normal_5fe02e09736cb.pdf
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/ketovikipetuz-majiwoju-zusowexiwaboxib.pdf
    • https://static.s123-cdn-static.com/uploads/4468838/normal_6007680732809.pdf
    • https://ximesadi.weebly.com/uploads/1/3/0/9/130969353/bevutar.pdf
    • https://static.s123-cdn-static.com/uploads/4370097/normal_5fca6a0de1bee.pdf
    • https://static.s123-cdn-static.com/uploads/4411932/normal_5fc9e5e7e92da.pdf
    • https://woremudof.weebly.com/uploads/1/3/4/7/134701645/2a8b2fa.pdf
    • https://ranazujip.weebly.com/uploads/1/3/5/3/135398887/7965113.pdf
    • https://cdn-cms.f-static.net/uploads/4412889/normal_6030f4fc61669.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/guwutivupudutu/arithmetic_sequence_worksheets_with_answers.pdf
    • https://s3.amazonaws.com/sefiwegegagu/tetapule.pdf
    • https://s3.amazonaws.com/tarizirefevifab/derby_county_match_report_today.pdf
    • https://uploads.strikinglycdn.com/files/b9839766-6d13-4a8c-8789-ba66f79ff094/how_to_get_free_itunes_codes_no_human_verification.pdf
    • https://s3.amazonaws.com/luxaduzimase/how_to_deflate_an_air_mattress_video.pdf
    • https://uploads.strikinglycdn.com/files/1b4144aa-9f0c-425d-9cc7-fe561ca71761/lowes_printable_application.pdf
    • https://s3.amazonaws.com/gifiz/16073940433.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e32e.bin
9307aa4d338bbc1e5450d95b066415bad715b9c930d1e5a89f78b90233c82c91		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE32E 5304 bytes
font_01_sfnt_off0000f525.bin
bccbbd300b571cd0101b305343326d5a85ae0fef8664e505c54f0e4f84b20996		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF525 11452 bytes
font_02_sfnt_off00011c79.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C79 4324 bytes

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