Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b5e418df1204b5f…

MALICIOUS

PDF

77.0 KB Created: 2021-05-07 08:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 69ba7bad29973721edb99abdea7f4f45 SHA-1: 12a70c8d0c378d311ee3af39d0dcee62429a772b SHA-256: 1b5e418df1204b5fb61f0437fe7e66e78ce9cabb408f5c90d709daef52f01acf
186 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. 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 0.9998

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/strik?utm_term=editing+marks+handout PDF link annotation
    • http://vijepuwobewi.mygamesonline.org/zifajox.pdfIn PDF document text
    • https://cdn.sqhk.co/vavefamixivi/UMD0hdc/31139101054.pdfIn PDF document text
    • https://cdn.sqhk.co/supibufuk/SNnmCVR/amazon_prime_music_vs_unlimited_bitrate.pdfIn PDF document text
    • http://lewuvumo.sportsontheweb.net/toxifukixasanavugowawuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487625/normal_600338e18ae64.pdfIn PDF document text
    • https://cdn.sqhk.co/tedubifo/b8Iiiig/rigetijowidano.pdfIn PDF document text
    • http://gezakiribonenin.mywebcommunity.org/mysql_workbench_user_manual.pdfIn PDF document text
    • http://mibotirekusiw.mywebcommunity.org/avicenna_canon_of_medicine.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/MhjrSCN/12698565152.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446036/normal_5fee77be174fc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mexijegedakol/antivirus_app_for_windows_10.pdfIn PDF document text
    • https://e79dab91-b8ca-4f03-a7cf-74564eaa1d8a.filesusr.com/ugd/009cd4_fb57c897b55e40b8b43dbc504b5a5843.pdf?index=trueIn PDF document text
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_9d84b80c158d41f982327d5c46050bc4.pdf?index=trueIn PDF document text
    • http://wemixapaw.epizy.com/lalobesekogesunodaxok.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/connect_with_your_spirit_guides.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/bellini_flannelette_sheets_nz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE484 4992 bytes
SHA-256: ce21885fb9a81fc2c618cbb6abfd3f1e5b5167eb2ab83a544ce7bc4ea1865304
font_01_sfnt_off0000f541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF541 10492 bytes
SHA-256: 8033d9d3712bfdb600c7bb2ace6fc050fe8dd7e822e95b061e734a34a5636341
font_02_sfnt_off0001192e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192E 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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