Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff10ee760d10356…

MALICIOUS

PDF

78.7 KB Created: 2021-03-14 07:01:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e088c5eb56d482095d0e63fd897239d9 SHA-1: 2f6933544337b2b17ebc9221d264ebe2a3578242 SHA-256: cff10ee760d10356c6d0fc42b504575445e1e822e8148e1e0dca52373ccc7b66
156 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 0.9993

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://jumiwimov.ru/strik?utm_term=what+is+the+theme+of+one+of+us+is+lying PDF link annotation
    • http://bio-ita.fun/padusofurapezisulojapabod6qwnw.pdfIn PDF document text
    • http://opticsystem.website/worigafoniverumuvaxefurahszoc.pdfIn PDF document text
    • http://zzzmmmmejjj.space/ford_mustang_gt_horsepower_by_yeareyicc.pdfIn PDF document text
    • http://lumobumekola.getenjoyment.net/dabivozapet.pdfIn PDF document text
    • http://mikazuxo.mypressonline.com/modern_business_administration_sixth_edition.pdfIn PDF document text
    • http://ufenmac.com/honeywell_r7284_hard_lockout_resetcr8w4.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/lumixi/aspectjrt._jar_1._8._9.pdfIn PDF document text
    • https://c3d762b3-5d50-4891-ab6d-43710edd2423.filesusr.com/ugd/3254bf_4727537ccd69473c8f47ff366068c62d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/89804523328.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/86604589851.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/tedom.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/punobodozimok.pdfIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_35ce330b06d149bdba5a4fd1536c3b18.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juduk/cache_memory_types.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/chiari_2_malformation_icd_10.pdfIn PDF document text
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_1705141cf63549b08905959171da0e3c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/ingenuity_automatic_bouncer_wont_bounce.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/51877940622.pdfIn PDF document text
    • http://fojakosi.atwebpages.com/74538094122.pdfIn PDF document text
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_7868a1752a524bf999059ac812d9dea4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/kaba_electronic_safe_lock_instructions.pdfIn PDF document text
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_dc780f74ef0f48ba96273121540bd1af.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/bamolojimusofabasokelaw.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/free_download_songbook_with_guitar_chords.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_off0000f3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CF 5200 bytes
SHA-256: ca536c90047806ecb933d5603de6f355eb7e3bb9112b78ecca1b7a62adfbe2a1
font_01_sfnt_off00010577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10577 11224 bytes
SHA-256: d63767324a474a3ed100052269f42766a368b331ed035e131cee886833cc253c

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