Malicious PDF — malware analysis report

Static analysis result for SHA-256 4020c99b212a3a0d…

MALICIOUS

PDF

85.2 KB Created: 2021-03-13 21:27:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 98334937ccf21dd31801a5f5fc42d377 SHA-1: b3708dbda20d97c362f85809850f9470c34dfd02 SHA-256: 4020c99b212a3a0d05cc55b68635fc0496fb28ad68eb907da4796c4dc85d5ed8
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://druttle.ru/strik?utm_term=verbos+irregulares+en+ingles+y+espa%25C3%25B1ol+lista+completa PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467003/normal_603ba840d0d0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505771/normal_60061cea18522.pdfIn PDF document text
    • http://tosatosekux.22web.org/gemuzedakosemedan.pdfIn PDF document text
    • http://unityfree.xyz/blood_clot_is_forming_after_tooth_extraction09mhh.pdfIn PDF document text
    • http://callipakk2.site/54208194291qjw99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446017/normal_602effe9a27fa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mebupeb.rf.gd/award_show_2018_bollywood_free.pdfIn PDF document text
    • https://ac65beef-1c88-4b01-a948-251493ed82f2.filesusr.com/ugd/09857b_200c9737589543bbb1d3100166ebbd50.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/annabel_lee_edgar_allan_poe_genre.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/dimudomowafo.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/29237863581.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/jusixanesidizenon.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/bollywood_new_film_box_office_report.pdfIn PDF document text
    • https://835a0401-7144-467e-aacc-710587930ffc.filesusr.com/ugd/432cba_69680aa0e9604a58bbb875f1f2adc96d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sefabe/xowelaso.pdfIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/first_alert_7010bsl_flashing_red.pdfIn PDF document text
    • https://46fb9a51-9e16-4ad8-811e-2f7ed01702f7.filesusr.com/ugd/53363c_5035c698bd314b8caaa5da5cbca65c8e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/tirulogu.pdfIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_68fe532d3906409e8b831d8ba3eaa90c.pdf?index=trueIn PDF document text
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_b527a98720fb4020925425c9d840f0c6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/simujix/what_is_the_smallest_subset_of_46.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54E 5672 bytes
SHA-256: e1b481b611d425d4ba59f83ddcf27f72765b178b3b92ea407605c087c08a150f
font_01_sfnt_off0001084d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084D 12236 bytes
SHA-256: 178a0d5527ab5ae4b55d74be1abe6891306113c9f5d26b6309a1511aabff87ed
font_02_sfnt_off00012e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9E 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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