Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c9afb8f6c2a1c26…

MALICIOUS

PDF

74.2 KB Created: 2021-02-23 00:06:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0e138f8815d5a373f94acef6099ed714 SHA-1: 0b3dd645b41d1f48f90d60c367fa4f538b8774c6 SHA-256: 9c9afb8f6c2a1c26e8b3624a2faacff53e3fb68f7ea10caf0b70c33a3775f2de
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which are to SEO-optimized PDF resources, suggesting a link farm or redirection mechanism. One of the extracted URLs, https://maypoin.ru/123?utm_term=sennheiser+ew+100+g2+bodypack+receiver, is directly associated with the PDF's content, likely serving as a lure. No scripts were extracted, but the presence of numerous external links points towards an attempt to redirect the user to potentially harmful content.

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://maypoin.ru/123?utm_term=sennheiser+ew+100+g2+bodypack+receiver PDF link annotation
    • https://vepodiruwa.weebly.com/uploads/1/3/4/3/134374194/86083ef63.pdfIn PDF document text
    • http://fastdonwload.space/6339626422973xjs.pdfIn PDF document text
    • https://lokevevivepino.weebly.com/uploads/1/3/4/1/134131736/terodaf_wedufemo_zaretifidote_kuziligobazile.pdfIn PDF document text
    • http://safilow.iblogger.org/new_orleans_causeway_traffic_report.pdfIn PDF document text
    • https://relotevifinedu.weebly.com/uploads/1/3/2/6/132683264/kenafudupuku.pdfIn PDF document text
    • https://xekekulok.weebly.com/uploads/1/3/1/8/131857590/b33f0b2abd9c4.pdfIn PDF document text
    • https://pebarefilegiz.weebly.com/uploads/1/3/5/3/135325086/6270fa2.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/bokexizometun/present_progressive_tense_worksheet_for_grade_2.pdfIn PDF document text
    • http://zukevajisuw.rf.gd/my_boy_free_games_apk.pdfIn PDF document text
    • http://desixomagi.epizy.com/n_s_g_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/11558532433.pdfIn PDF document text
    • http://lamujep.rf.gd/figusa.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/zutixifizek.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/legend_of_zelda_encyclopedia.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_off0000e2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B9 6192 bytes
SHA-256: 16d5742a662530ab74ad3628b5d70da6ab98053e835267a6d904e309045f9ade
font_01_sfnt_off0000f7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DA 10588 bytes
SHA-256: a90ee1186b41cddfa4e9d6e6683c6c26bdc178d8d53d5cfdc78718a2d33e3423

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