Malicious PDF — malware analysis report

Static analysis result for SHA-256 5581ea59c1df3400…

MALICIOUS

PDF

88.5 KB Created: 2021-04-05 18:35:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3b00d3c80052c3a2fee7e57f026abd8c SHA-1: 327a904a03cbd8f6a53acf1080fe57955e7db947 SHA-256: 5581ea59c1df340097983f3c09f59e0cfbcd93eaddde4b1c7924d99392664d27
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 0.9998

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://resalured.ru/123?utm_term=ce+conformity+australia PDF link annotation
    • http://50off.pro/how_to_apply_for_hajj_2020_from_pakistanh8v6z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372361/normal_603598d05cf3c.pdfIn PDF document text
    • https://xufiwelak.weebly.com/uploads/1/3/1/1/131164558/sigodeweme.pdfIn PDF document text
    • http://dokukuke.mypressonline.com/english_amharic_context_dictionary.pdfIn PDF document text
    • https://kusawagefeduzuj.weebly.com/uploads/1/3/0/8/130874333/livovodiwejamaju.pdfIn PDF document text
    • http://koprovk.xyz/81429216368h3jbq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470035/normal_5fe66c3dc1ab7.pdfIn PDF document text
    • http://tomandbxof.site/dufipifotolj0ixz.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/bogeguva/diresalefifetabiwivivi.pdfIn PDF document text
    • http://lesidiwajenowil.myartsonline.com/braun_series_9_cleaning_station_worth_it.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/angular_forms_module_example.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/arya_movie_song_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/auraria_campus_map.pdfIn PDF document text
    • https://746420f6-3007-491b-ba72-fd43be5094e5.filesusr.com/ugd/277b62_b1a53925aa604db195848586a260bbe3.pdf?index=trueIn PDF document text
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_37708f57f85948118e379c37debefbb9.pdf?index=trueIn PDF document text
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_a89bdcf36bd241179812f4609bc9a197.pdf?index=trueIn 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_off00011d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6C 5032 bytes
SHA-256: a5427274abc034758c433426c2cee1f51699bccf1992dec2eb1a52a87e06fc6e
font_01_sfnt_off00012e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7B 11488 bytes
SHA-256: 3c262e72d48335ed6b7a7cf4489dc56aa872a260bdbeff03b013fb8bed325946

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