Malicious PDF — malware analysis report

Static analysis result for SHA-256 627efce0cad94242…

MALICIOUS

PDF

70.1 KB Created: 2021-04-03 00:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d06188097cda042fb0a9284d2ffa4601 SHA-1: c16628345c435ba697c204611569425e496de502 SHA-256: 627efce0cad94242df5334553dc04f219d014c9425eb4584ae7d2f6868025551
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. The ClamAV detection further confirms its malicious nature, classifying it as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/123?utm_term=free+short+vowel+worksheets+for+second+grade PDF link annotation
    • http://skout.tech/billie_eilish_unreleased_songs_playlist27t73.pdfIn PDF document text
    • http://dmdmassage.com/999661962678t264.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373755/normal_5fcaeb671858e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465941/normal_6026d4d154fc5.pdfIn PDF document text
    • https://sogatetemurus.weebly.com/uploads/1/3/4/3/134379625/5763093.pdfIn PDF document text
    • http://good-production9.site/zifumumezegefamni0nz.pdfIn PDF document text
    • https://dezirivudamowi.weebly.com/uploads/1/3/1/8/131856369/bdd23a1d0d7ab9.pdfIn PDF document text
    • http://ses-paypal.com/what_is_the_purpose_of_narrative_researchujmbt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414672/normal_605b05301850a.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/sefabe/html5_preview.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/robarotusaroxoxufom.pdfIn PDF document text
    • http://wapuzega.rf.gd/semantic_analogy_download.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/38144813988.pdfIn PDF document text
    • http://kisolapuri.rf.gd/34272922473.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/apush_midterm_review_questions.pdfIn PDF document text
    • http://josetevuj.epizy.com/31183220384.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/farewell_my_lovely_book_sparknotes.pdfIn PDF document text
    • http://xikabuw.epizy.com/ccna_self_study_or_course.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/fepiromutobobomej.pdfIn PDF document text
    • http://sofirenapirovo.rf.gd/chain_rule_quiz.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_off0000d4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F6 5456 bytes
SHA-256: 0df8cc66eb57e5b0d9e8156d721438e847d998239f41f8f99a1c311ac79061a4
font_01_sfnt_off0000e79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79A 10384 bytes
SHA-256: 73fb3344e257194ca06c995b04885fc46a651aa7a8433067a8fc7f7e24020920

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