Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c3f7af87abb403…

MALICIOUS

PDF

100.9 KB Created: 2021-04-02 19:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5f7179f2e1f70e21c83f972f33dfe61b SHA-1: 522312ea475a786242b33a7a224708bece0396f4 SHA-256: 78c3f7af87abb4033213354fd85c60c675ac9db7cdb6aeb11ae9d9d975635f54
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 0.9997

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 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://pelibifir.ru/wix?keyword=extraordinary+measures+worksheet+answer+key PDF link annotation
    • http://gukiduwonaxinef.getenjoyment.net/pipipavidababizelodit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501632/normal_605d83292537f.pdfIn PDF document text
    • http://xazupadapafow.mypressonline.com/20972729185.pdfIn PDF document text
    • http://nuduxebevevewu.22web.org/rules_of_past_perfect_tense.pdfIn PDF document text
    • http://guzexesuge.mypressonline.com/voxativor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463552/normal_5fddbb7ac0df1.pdfIn PDF document text
    • http://lesuxofozadize.mygamesonline.org/malovewenixanagutudulesa.pdfIn PDF document text
    • http://tubujek.iblogger.org/jevikotuvaf.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/bfdc1346-a9cb-4a30-8451-c97e62872750/bissell_proheat_2x_revolution_deep_cleaner_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/reading_comprehension_grade_4_worksheets_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21e9271e-4ec5-4c16-942b-039ae9c2fcb7/pesepuso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d2f8e31-7411-4813-a16f-87531ad22a9e/a_street_cat_named_bob_book_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43f0934f-cdae-431c-bddc-67a025fa8832/98155704313.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4644e7b7-da80-4b38-8fdd-a18522445288/42044629819.pdfIn PDF document text
    • http://bibarixe.epizy.com/anti_inflammatory_diet_food_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c5f8071-e726-4aee-aa8c-eb64b063baa2/bitinotaxilegepuvov.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/divagizideseporaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6e24efc-d24f-4c1d-a035-0b5293eecc69/72704525074.pdfIn PDF document text
    • http://zusuxib.rf.gd/gumivuti.pdfIn PDF document text
    • http://fijorolur.myartsonline.com/67947701371.pdfIn PDF document text
    • http://zujebagita.epizy.com/3034502795.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B6C 5316 bytes
SHA-256: 5b4928aee0b243c57a41fa4010c41cced73641f39701a86ead1eddd2d556b401
font_01_sfnt_off00015d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D72 11956 bytes
SHA-256: f0e6b439fbb12dafc794df33526bee432b0700b5552d5dce83266bbad0f4c4a6

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