Malicious PDF — malware analysis report

Static analysis result for SHA-256 426101ad98860add…

MALICIOUS

PDF

69.6 KB Created: 2021-09-21 01:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4e9e35b0e8d598c8e91604ef62dbc274 SHA-1: 4b46703d10081d7891c7fd2d77f14d7967de34d3 SHA-256: 426101ad98860add62e06def575b5815da203f19786b475802fa900452781a29
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous distinct hosts, one of which is a suspicious PDF file. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 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 http://zkqzl.com/uploadfile/file///2021092105173488.pdf In PDF document text
    • http://teplo76.ru/uploads/file/tesevite.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/doxamokopazawotofomemajaj.pdfIn PDF document text
    • https://afayl.com/userfiles/file/24519008666.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/nezinovupesaxegor.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133520cdbd77---66522082632.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210921024843.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/moguk.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/wedejatanujilefem.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/fexanijomutupomoboke.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021092106130127.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/kesimomarakosojawovorul.pdfIn PDF document text
    • https://titishop.co/upload/files/19769127124.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/810946084.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/17789071060.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/xetix.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/zanewumulasozekotusejisom.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/37368562092.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/soxamexak.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/93411148531.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/odomajeke.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1631079189.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=car+games+for+android+free+downloadPDF link annotation
    • 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://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_off0000b152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB152 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC964 15404 bytes
SHA-256: 4f43fe8f701be2e030c6fa1f811b1d48738998aee967d2363d476b82daa13791
font_02_sfnt_off0000f088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF088 10716 bytes
SHA-256: 742148c4274ec58208c4abf18ba598c442d0c1fa9bf3676c980e1a34776be67f

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