Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1ea0ff62ac330e…

MALICIOUS

PDF

91.9 KB Created: 2021-03-15 02:11:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6e305befe205a5d673af8811925821d SHA-1: 44123403670897d0e03345dea60a5298e11db90c SHA-256: 4a1ea0ff62ac330e810f1d9cca7938e1471de893e25f153f5b481b6885282559
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, a technique often used in SEO link farms to manipulate search engine rankings or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/wix?keyword=kindred+octavia+butler+pdf+free
    • https://rizaguvaza.weebly.com/uploads/1/3/4/5/134502188/ditutupozij-pudun-xolibubok-wudewotudazog.pdf
    • https://cdn-cms.f-static.net/uploads/4374374/normal_600e6d21e7c16.pdf
    • http://kepibarufot.22web.org/lapujabosumadefovajuw.pdf
    • https://xorukulimuz.weebly.com/uploads/1/3/4/7/134728044/c3145a.pdf
    • https://cdn-cms.f-static.net/uploads/4495531/normal_6039d38ed7e53.pdf
    • https://ferizovewop.weebly.com/uploads/1/3/4/8/134887996/9244788.pdf
    • https://sitofozaliwi.weebly.com/uploads/1/3/4/3/134355749/xanebosemelar_binatapodotofug.pdf
    • https://static.s123-cdn-static.com/uploads/4403946/normal_5fcfa812635a1.pdf
    • https://moxuronanupew.weebly.com/uploads/1/3/4/5/134597487/tobubitaviwera.pdf
    • https://nepopuzabigeju.weebly.com/uploads/1/3/4/8/134856357/lupovofanikazavore.pdf
    • https://cdn-cms.f-static.net/uploads/4402504/normal_6021effd38ef9.pdf
    • http://jedomagisuw.getenjoyment.net/cours_sur_l_amplificateur_oprationnel.pdf
    • https://mokadipubozot.weebly.com/uploads/1/3/2/3/132303064/jujeroli.pdf
    • https://buwulikifem.weebly.com/uploads/1/3/4/5/134583505/zunuzi-rebarovajibu-suxoza-xodutet.pdf
    • https://cdn-cms.f-static.net/uploads/4478670/normal_603f4a2ab0a15.pdf
    • https://cdn-cms.f-static.net/uploads/4484623/normal_5fd83eac3d471.pdf
    • http://samafutanub.mypressonline.com/18400958949.pdf
    • https://fuwewarudizikip.weebly.com/uploads/1/3/4/6/134644733/zatizavotemifimixuf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gedokimisizat.rf.gd/magitogokoxofax.pdf
    • http://rowesatuminef.rf.gd/9929645825.pdf
    • http://mepixijoje.epizy.com/niwoxiwab.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011451.bin
d6fc056470b9dfab91468b1c64399e108f3f8c55412a21a0e9e8e5db416a899d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11451 5140 bytes
font_01_sfnt_off000125e9.bin
a9aa213124258444407f66f4ee7088d90ec6909d6a68eb373cbf6906a778e466		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125E9 10980 bytes
font_02_sfnt_off00014b74.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B74 16204 bytes

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