Malicious PDF — malware analysis report

Static analysis result for SHA-256 d870d33867885696…

MALICIOUS

PDF

73.4 KB Created: 2021-04-03 07:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: db09027116b1a46ba4defcf62b036c93 SHA-1: 8fc5c3b419b6d3b728d8281099b7bab481090c01 SHA-256: d870d338678856960cd4070c5cb598e1789b38061c74057a31c951dd952a047a
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to appear as legitimate academic resources. The ClamAV detection and ML classifier indicate malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8388

Heuristics 4

  • 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
  • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

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