Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b118af090cb2eb8…

MALICIOUS

PDF

73.9 KB Created: 2021-02-20 12:27:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 8c8348135d1f57d87deef27069f3a018 SHA-1: f9149d55f100b861b5bb861ef85ed12728c24b4e SHA-256: 4b118af090cb2eb82541180704f19b5cbfbdeb3de52f445167aab64dd4cde237
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, with one pointing to a suspicious domain ('maypoin.ru') and others to S3 buckets and Weebly domains, suggesting a link farm or distribution mechanism. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=do+entrepreneurs+think+effectually PDF link annotation
    • https://bejetatibuket.weebly.com/uploads/1/3/5/9/135957672/rajidufa.pdfIn PDF document text
    • https://fowowudajij.weebly.com/uploads/1/3/5/3/135312379/zetonigip.pdfIn PDF document text
    • https://mazoguwikite.weebly.com/uploads/1/3/4/6/134614920/suxabujifoza_noxilivedupi.pdfIn PDF document text
    • https://lanoxujuzon.weebly.com/uploads/1/3/4/6/134630121/3066189.pdfIn PDF document text
    • https://pipabujul.weebly.com/uploads/1/3/2/6/132680817/2632821.pdfIn PDF document text
    • http://xelipev.22web.org/8329511215.pdfIn PDF document text
    • https://vidujari.weebly.com/uploads/1/3/4/8/134858315/jumenudodijenajib.pdfIn PDF document text
    • https://kotuposa.weebly.com/uploads/1/3/1/4/131406283/bofeteke-falom-kewekal.pdfIn PDF document text
    • https://debozapo.weebly.com/uploads/1/3/1/1/131164198/9024188.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/crossword_puzzle_answer_for_bellyache.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/advanced_excel_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/6325436434.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/sekixiwevokaxi.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/mojugutikadekajuvabeduw.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/retolitegedon.pdfIn PDF document text
    • http://kazaxese.epizy.com/a._a._attendance_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/58285992392.pdfIn PDF document text
    • http://medesawawolujim.epizy.com/41636739701.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/22918130800.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_off0000e2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DA 5268 bytes
SHA-256: 29afeb7a1aaee596f30c2336e0cfd253663eba373a79a1e7a67a32f013bd0611
font_01_sfnt_off0000f4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D2 10496 bytes
SHA-256: 93d18bd31613127425998805caa15fcdfcc053344eaba0d7251a906244b37c5a

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