Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e4260afd5329ffb…

MALICIOUS

PDF

69.7 KB Created: 2021-09-24 18:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9fde3e2ec3634d4ab83025c9ae9a02bf SHA-1: 7228df4ae3faebcc9e636be07876623f38c55445 SHA-256: 7e4260afd5329ffbca2000278ebdcf674b4a8ef8ed4cef1d02754397532b4ff0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. This strongly suggests a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support the malicious nature of the file, indicating it is likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://nomylo.ru/uplcv?utm_term=custom+rom+corvus+redmi+note+5 PDF link annotation
    • http://realtor-madrid.com/uploades/fckeditorfile/vadov.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/pewidilixem.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/48871515638.pdfIn PDF document text
    • https://medtek.vn/storage/file/jeloxozadepazeri.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/jisunorov.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210919_AB91F3A9D81B509A.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/fugolud.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/84977780200.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/54331693890.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/42462728331.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/67919430633.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/nemotezifaxavuf.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/89241531654.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148f724657df---88792213982.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/90767845736.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/48235101542.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614622e4732eb---nivikuj.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210902211409.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/35786535903.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/lexedajokapivujasemaj.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/zamenumulanuvanamexew.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/juturodarijujitafufolutu.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/xilukesimowogifiviz.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://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_off0000aecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAECD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E4 10656 bytes
SHA-256: 7d24e273889bbe850ab5018dae79d3fc68fb453baffb48019f956aff720488dd
font_02_sfnt_off0000df63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF63 16456 bytes
SHA-256: c7ec4a442b10e2e339312282c76e71ff76ceda5e6d1ee8277de0af7e585ad15c

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