Malicious PDF — malware analysis report

Static analysis result for SHA-256 55174822c09e271a…

MALICIOUS

PDF

82.4 KB Created: 2021-04-22 23:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76ad7cffdc588b3c2694314a7d33f1a0 SHA-1: b40eb4bb01f97c68a1265c66c6df958f2cc1a09d SHA-256: 55174822c09e271ad8ba9e28d284882356e4020f5312fac6311e7aae815f4bd4
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The primary attack vector appears to be the embedding of a large number of external links, with the heuristic 'PDF_SEO_LINK_FARM' specifically identifying this behavior. The URLs extracted suggest a potential phishing or SEO spam campaign, aiming to redirect users to malicious or untrusted sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/strik?utm_term=vias+de+administracion+de+medicamentos+pdf+unam PDF link annotation
    • http://palubofapejuraw.mywebcommunity.org/36635993953.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466664/normal_5fc94e85e03b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486037/normal_6051295adc944.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452850/normal_60375b84acf50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414172/normal_605cf13fea6e4.pdfIn PDF document text
    • http://nunesop.scienceontheweb.net/zudexaloveli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388271/normal_6026fa0ee64e9.pdfIn PDF document text
    • http://fipizilemuwob.medianewsonline.com/panther_chameleon_care_sheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422390/normal_600fc9721901e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444853/normal_6023792d2d526.pdfIn PDF document text
    • http://janipuwibir.mywebcommunity.org/wavagonavufomo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc49468d-4712-4203-ab28-03a7b37d69c7/5000_year_leap_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/36228065168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f378926-ec1b-4623-b665-21fd9f2688c8/92489227376.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/45803909586.pdfIn PDF document text
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_fdc0c4907b86475fb7daca467407d8f0.pdf?index=trueIn PDF document text
    • http://xanedemu.onlinewebshop.net/60961037216.pdfIn PDF document text
    • https://52431b39-7396-4b0c-bcaf-ab72d449a1bf.filesusr.com/ugd/f8cef3_ed35f7cdbac1488891e7a5fbef7973ab.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/03b3ee4b-1510-41f6-bb33-64585ec25fcc/93618407833.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/autograph_movie_full_hd_video_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/keynotes_homeopatia.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/android_versions_list.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_off0001006d.bin
22c61c1c4af2428dafb4c7fe485138a800789832326bf49f8a4d0cb5e1f1694e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1006D 5236 bytes
font_01_sfnt_off0001122b.bin
7dce9ab6fe0935c6149c6e91a3975e7dcbf235c295258e250ff1c9ea0c1ca95a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1122B 13116 bytes

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