Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d803ea38455d224…

MALICIOUS

PDF

78.9 KB Created: 2021-03-25 05:45:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fdec9d12cc965e64627060923537c2b2 SHA-1: 55bb5d430268873b2cdb4c23b8865c66664ff2ad SHA-256: 6d803ea38455d224b52aad76be58a442670223a1b24dc6d32b2b20f6cfc62768
172 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many of which are to PDF files, suggesting a link farm or SEO poisoning attempt. One of the extracted URLs, 'https://pelibifir.ru/wix?keyword=proportional+reasoning+worksheet+tes', is likely part of the lure to download a secondary payload. The document body, though heavily obfuscated, contains text related to 'proportional reasoning worksheet', indicating a social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/wix?keyword=proportional+reasoning+worksheet+tes PDF link annotation
    • https://datipozor.weebly.com/uploads/1/3/0/8/130813945/cdb398a.pdfIn PDF document text
    • http://okstore.info/android_9_samsung_j7_pro7azpn.pdfIn PDF document text
    • https://purigimotefejis.weebly.com/uploads/1/3/4/3/134308192/604870.pdfIn PDF document text
    • https://pozefixinez.weebly.com/uploads/1/3/1/4/131454190/551d55.pdfIn PDF document text
    • https://gadolelexuzited.weebly.com/uploads/1/3/4/4/134486477/mutadoxum.pdfIn PDF document text
    • http://swiss-gear.store/piramides_de_malpighi8tx5p.pdfIn PDF document text
    • http://my-favshopd.online/502395469938j9ge.pdfIn PDF document text
    • https://rixagaxovexi.weebly.com/uploads/1/3/4/0/134000332/bifinibixapotezadu.pdfIn PDF document text
    • http://fresh-ita.space/kupikexi2b66p.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/kudufigunabi/mugokewiziza.pdfIn PDF document text
    • https://ba3a7bb5-edd2-4228-b29c-cf272df6a868.filesusr.com/ugd/bd1c09_ab8074412e534ba6bbf4e379238081a0.pdf?index=trueIn PDF document text
    • https://0778d94d-b67d-49c3-8f6f-43f52d6edec9.filesusr.com/ugd/b85eb0_93679bae0de6457c98da67a14205d92a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/94375589936.pdfIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_715bac2dba2c40599647f27bc5e7b190.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/visamodalovuxerezubimof.pdfIn PDF document text
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_7890086bc46745298b246d419a13f9cb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sazomo/informatica_bdm_10._2._1_installation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/technically_wrong_free.pdfIn PDF document text
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_1ccd2dd22f1b4e578a7534b0535b727a.pdf?index=trueIn PDF document text
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_ba7af33ad649438c803491c97a7f4ce5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fipijife/vimizotifixozelajuv.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/object_oriented_programming_c_book_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/incremental_policy_making.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/all_island_animal_disease_surveillance_report_2017.pdfIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_774faa9bab7942c5b1159ba2b5467936.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D4 5236 bytes
SHA-256: f825cab2e2a70fd6cae9fac570ffc91e7a63b46639a5a8f051423e9b4b707892
font_01_sfnt_off000106ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AD 11504 bytes
SHA-256: 88b2dc2385045166e340f625864483e5d07c1efe3a83aa6164cb81b42a84c410

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