Malicious PDF — malware analysis report

Static analysis result for SHA-256 7255c0c1313414ca…

MALICIOUS

PDF

80.3 KB Created: 2021-04-03 07:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e3671de4e381013f05d266ea3bbfb5a5 SHA-1: 7e965711ec23d6acc326d24ce483ccb4babed793 SHA-256: 7255c0c1313414ca6151a477ee903465d3300311677bfd1ae5673af2bcbddb7e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including a link farm, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier strongly indicate malicious content, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/award?keyword=cardiovascular+system+assignment+pdf PDF link annotation
    • https://zozufawagizawag.weebly.com/uploads/1/3/4/4/134454621/8423083.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460706/normal_602c61ce80f52.pdfIn PDF document text
    • https://cdn.sqhk.co/lisesemafo/f0heijl/tisaso.pdfIn PDF document text
    • https://cdn.sqhk.co/sewitakin/omjijbG/jukevirivujotixewovosid.pdfIn PDF document text
    • https://worofinuwur.weebly.com/uploads/1/3/4/5/134582463/karuvugejiti-bemeziroliruv-tojixoba-gegalubezini.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476930/normal_5fd2c37bd3cbb.pdfIn PDF document text
    • https://cdn.sqhk.co/foroboreb/ihichaE/bezojowejiwozezatuzol.pdfIn PDF document text
    • http://konsalting.info/ted_chiang_liking_what_you_see_short_storymf84m.pdfIn PDF document text
    • http://checkmyscore.info/california_cooperage_hot_tub_instructionszwawe.pdfIn PDF document text
    • https://sovurides.weebly.com/uploads/1/3/5/3/135349611/fuxikurikifawi_jikuwetijixavuv.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/bipepezuwed/vizio_d-series_32_1080p_full-array_led_smart_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36e1c04f-5ba3-4aef-bee1-2bb39620be37/how_to_crochet_for_absolute_beginners_part_3.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/88223357506.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/lumog.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/carrom_disc_pool_mod_apk_latest_version.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/bharat_movie_trailer_full_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/543f1d19-d0f2-4df2-9a97-e511dbf0f4ff/adverb_examples_a_to_z.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_off0000fb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9D 5540 bytes
SHA-256: ee8fdbf3e68bb358fa4bf185507c81e327d49099abc0949aacd58c417576f54c
font_01_sfnt_off00010e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E72 10604 bytes
SHA-256: 5818db450ac4d9c2ec4827d07bb0a81936c4f3695ecfd70a197ae0beba70510f

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