Malicious PDF — malware analysis report

Static analysis result for SHA-256 081283e9e0f56dd7…

MALICIOUS

PDF

78.4 KB Created: 2021-03-20 17:57:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c3f31a2982df39aaaaa93406c2ee6481 SHA-1: 99d04a9e1ac88dbd38232023f41f36af9315e2d3 SHA-256: 081283e9e0f56dd799d8453c3f126db50a73d2b515b60cd668d5803c7dc81e1c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://midufefew.ru/award?keyword=perfect+tenses+in+english+pdf PDF link annotation
    • https://cdn.sqhk.co/xevowuto/jfDpXQr/bike_jumps_for_sale_australia.pdfIn PDF document text
    • http://wogivodugakovek.mygamesonline.org/basic_helicopter_aerodynamics_3rd_edition.pdfIn PDF document text
    • http://ideal-it.fun/495457427331solq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487662/normal_605545b7bacd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379046/normal_601f2bf83590c.pdfIn PDF document text
    • http://riwuvodobopexu.mywebcommunity.org/stop_motion_animation_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/fazovivum/07qO0jc/83414304548.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371808/normal_604d88f448627.pdfIn PDF document text
    • https://cdn.sqhk.co/vibebexez/icljegg/marageleruvomo.pdfIn PDF document text
    • https://cdn.sqhk.co/zerurukoraju/8u3V0AD/78940849969.pdfIn PDF document text
    • http://mesretly.xyz/88767883244fs9y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470412/normal_603eac6d80bf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456121/normal_602f81e7120ab.pdfIn PDF document text
    • http://ravasixojodari.mygamesonline.org/math_symbols_in_english.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401732/normal_5fdd223c41c62.pdfIn PDF document text
    • http://reawont.online/103147774565ao2d.pdfIn PDF document text
    • http://pagavopalubutu.scienceontheweb.net/conditional_formatting_in_excel_2020_with_formula_examples.pdfIn PDF document text
    • http://deladinabixek.sportsontheweb.net/nedudaj.pdfIn PDF document text
    • https://cdn.sqhk.co/fosikikevo/Igcgckn/chinese_university_of_hong_kong_business_school_dean.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460255/normal_604d414ace461.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e3b6b3a-500a-4c63-92b3-038d421d0d01/cuanto_es_un_decimetro_cuadrado_en_centimetros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/543b6e60-25cb-4a4f-bdc2-7c58440fe2e0/the_chocolate_touch_book_free.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_off0000f5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F2 5208 bytes
SHA-256: e5139512d6d71460b55fdbb2b1695e6d4370fb428362ff2484cf787d2a798f88
font_01_sfnt_off000107a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A7 10780 bytes
SHA-256: f4c550aef4b2b21c1c7c0c985fda0308ac05d5cdc1650b8d4875c886d2bdaa47

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