Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ae0df141e79461…

MALICIOUS

PDF

84.6 KB Created: 2021-03-31 03:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d08ed581e2deaca8475171b35564bdf3 SHA-1: 8e38b18ee03ccbd33aa5109a9fbd3c7a89762e9b SHA-256: 52ae0df141e79461f6021df0426c0e936d2b117fb340e2b327af9a619a8951b1
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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=que+diferencia+existe+entre+purinas+y+pirimidinas PDF link annotation
    • https://temizugejifo.weebly.com/uploads/1/3/1/3/131384470/949641.pdfIn PDF document text
    • http://forpost-electrica.ru/airplane_seatbelt_sound49cs7.pdfIn PDF document text
    • http://lg-supportteam.com/wivazevijaviveruvujukiku0q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455916/normal_604180414e2e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366042/normal_6047bd69ba690.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471945/normal_60103e511d42a.pdfIn PDF document text
    • https://luvodufugatese.weebly.com/uploads/1/3/4/8/134893210/nejiribesireb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416918/normal_5fdbc6718860b.pdfIn PDF document text
    • https://fojowixejomad.weebly.com/uploads/1/3/2/6/132681658/0eb432bb632f.pdfIn PDF document text
    • http://hydrofthol.space/cue_sheet_editor7hqej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470399/normal_5fd68d4450590.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_42ee17c3c81e440588a1c5dd75e09aa6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/jitopagosobekojinax.pdfIn PDF document text
    • https://467375c7-a7a6-4806-a9b7-892c2a528f89.filesusr.com/ugd/911174_1913dadbf91a446fa2b18b3260496781.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/60929413656.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/rusuton.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/owners_manual_for_samsung_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/49663489572.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/kunivib.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/how_to_tell_if_a_soap_dispenser_is_foaming.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/sopevinaxub.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/all_india_radio_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/85883690933.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C5 5500 bytes
SHA-256: 810f6344ccf1a5954b109360d8ba6dead8ec35159107bb108209dcf4d6f4c161
font_01_sfnt_off00010a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A75 12636 bytes
SHA-256: 31cb97a2a5bba92143f883e30bd9f84dda798cc0a59fe4ef1b1c21c7045fa1a2
font_02_sfnt_off0001338d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338D 4260 bytes
SHA-256: 89934af4014e2f41a2c271d036d7092fe7207c44c2915785060f2f8337522eba

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