Malicious PDF — malware analysis report

Static analysis result for SHA-256 676553f78b54165b…

MALICIOUS

PDF

86.1 KB Created: 2021-03-17 21:08:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 191559a4916efd5f22a88bfb1e349bdc SHA-1: 11d002201e0fb4c9a990c29af04e2b3b55da75c4 SHA-256: 676553f78b54165b08f239186a3168fb1c30866e6941eae274d32e3b93e0c554
186 Risk Score

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 0.9992

Heuristics 6

  • 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.
  • 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://bologen.ru/award?keyword=civil+engineering+building+materials+pdf PDF link annotation
    • https://malufatagu.weebly.com/uploads/1/3/0/8/130874424/selil.pdfIn PDF document text
    • https://sapafusazefo.weebly.com/uploads/1/3/4/4/134496158/gekezinida-kabowifonut.pdfIn PDF document text
    • https://cdn.sqhk.co/figesuweno/ibrjahj/gatuvatufadorefeturalev.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/dLAgepK/admission_form_format_for_coaching_classes.pdfIn PDF document text
    • https://cdn.sqhk.co/tinupolureg/gfkOVE8/game_rev_heads_rally_mod_apk.pdfIn PDF document text
    • https://kiwakamumosa.weebly.com/uploads/1/3/5/9/135963193/vufemukareji.pdfIn PDF document text
    • http://lologunaw.mygamesonline.org/xobudozegodepupikeduz.pdfIn PDF document text
    • http://jovopomutulilo.medianewsonline.com/your_own_market_stall_skyrim.pdfIn PDF document text
    • https://cdn.sqhk.co/torazanopuni/7Jd6Phf/73288566905.pdfIn PDF document text
    • http://zisapawiwako.mypressonline.com/carl_rogers_theory_of_personality_in_hindi.pdfIn PDF document text
    • http://jisetatiloro.scienceontheweb.net/tixoretagizub.pdfIn PDF document text
    • https://cdn.sqhk.co/xovujiroveg/didiajN/cleaning_services_business_plan_template.pdfIn PDF document text
    • https://sawotulexude.weebly.com/uploads/1/3/5/2/135298589/bonorabapako_nopukuborojo.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/belapawerezuju/miduvadarukaruxosofidopan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed777515-0b10-4a0d-bb9c-a7fb3571a4e0/how_much_can_you_earn_teaching_english_as_a_foreign_language.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4790524-f612-45e0-8f8b-31b5190d7754/71452007082.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/sudufusexowejipet.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/physical_education_assessment_rubric_template.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/37251879931.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/c_r_l_ka_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/how_do_i_adjust_my_g_shock_5081.pdfIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/glue_plexiglass_sheets_together.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8d22a80-29b8-4a2d-8429-898731755757/fiwigadekiteguv.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_off000112e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E6 5468 bytes
SHA-256: e151cd78746e8fd4b21551990963aae74b9c4a5879562c4fd1081e0d0b64b11c
font_01_sfnt_off00012563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12563 10860 bytes
SHA-256: 4e19f5a3cace29cb71258212a3260c3014b19b971c6d387199caf70021006586