Malicious PDF — malware analysis report

Static analysis result for SHA-256 f166db1ad386e923…

MALICIOUS

PDF

85.3 KB Created: 2021-05-01 22:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6988aa59f4db89ba44e09670497db544 SHA-1: ccfb1e1cad81b1bd11933fce4ecf759d5eca2073 SHA-256: f166db1ad386e923bf2f60d82beb013879b4371ed31b09620ca39ae5b2a12ed2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files, indicating a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=how+do+you+respond+to+a+negative+review+example PDF link annotation
    • http://naxajogilelog.medianewsonline.com/60432977157.pdfIn PDF document text
    • https://wudowured.weebly.com/uploads/1/3/0/8/130873715/3e938a.pdfIn PDF document text
    • http://usacarins.com/birthday_pictures_hd6jbto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417206/normal_601d232a4d263.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450727/normal_60532637af624.pdfIn PDF document text
    • http://aslixan.com/febejosinibolexijuporeb4u720.pdfIn PDF document text
    • http://ru-payment.casa/todupapazikezolj525r.pdfIn PDF document text
    • http://tetizeniwa.mypressonline.com/45301553686.pdfIn PDF document text
    • http://dmdmassage.com/how_to_use_brother_pt-h1003mjjh.pdfIn PDF document text
    • https://bexusisase.weebly.com/uploads/1/3/4/5/134596812/3072223c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369499/normal_5ff1b08d00b52.pdfIn PDF document text
    • http://oneitstore.info/rubber_sheet_for_bed_near_meimslg.pdfIn PDF document text
    • https://butiriretife.weebly.com/uploads/1/3/2/6/132681404/betuxawo-dotol.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/wukevirenesu/85759785475.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/vugijedor.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/26137961814.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/pepiwowama.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/bajirao_singham_full_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/standard_of_perfection_rabbits.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/ahmedabad_mirror_newspaper.pdfIn PDF document text
    • http://zobuwijezad.onlinewebshop.net/juriw.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_off00010f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F32 5564 bytes
SHA-256: dcd66dd4677e9471e1dbf0a848ab39afb0df93df0b271952eb33b81975169a83
font_01_sfnt_off0001222c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222C 11064 bytes
SHA-256: 34c29dc4ccf07536e3a050827b8dfe7d5a73eaf954b1b163214ee0ae165214ee

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