Malicious PDF — malware analysis report

Static analysis result for SHA-256 890a5ad3b0284537…

MALICIOUS

PDF

71.2 KB Created: 2021-03-31 02:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a0e0807323f3f228d5b973b2ff2545d8 SHA-1: 8d03d5a7ab45ca3376487a3ad66ab6d39186eca4 SHA-256: 890a5ad3b0284537b45ef1a377c13f05a6224c8ca8555b93153914eaf2c99bd9
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 0.9997

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 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/award?keyword=byram+hills+calendar+pdf PDF link annotation
    • https://waxogisuges.weebly.com/uploads/1/3/0/7/130776632/909b2ed6.pdfIn PDF document text
    • http://reliables.ru/android_obd2_scannero3x93.pdfIn PDF document text
    • http://manthoughtswebsite.website/is_corsair_commander_pro_worth_itlzg8v.pdfIn PDF document text
    • https://jidupedepinamup.weebly.com/uploads/1/3/2/6/132680921/3838440.pdfIn PDF document text
    • https://xatefokagakutil.weebly.com/uploads/1/3/4/1/134108848/1099836.pdfIn PDF document text
    • https://feroxetisilujux.weebly.com/uploads/1/3/1/4/131409167/4943e4d0f090b4a.pdfIn PDF document text
    • https://cdn.sqhk.co/tikalijit/U93fErJ/deck_wallet_for_clash_royale_arena_11.pdfIn PDF document text
    • https://cdn.sqhk.co/rixakowu/gcJqYhj/furelinomodanurevazuvug.pdfIn PDF document text
    • http://matroskin.space/quantitative_research_articlesi3o1o.pdfIn PDF document text
    • http://de-bewertung-889562.icu/21376298601vmtqr.pdfIn PDF document text
    • http://5coupons.info/vomorolodiv3zv1a.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/tugumeb/selugigutefanivajowolo.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/how_to_write_an_essay_example_english.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/xafezoxufixulotabogudovo.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/69851504976.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/yandex_disk_app.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/movie_intro_after_effects_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/nra_range_safety_rules.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/80099230373.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/68982708042.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_off0000d788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD788 5544 bytes
SHA-256: e0b486ac33f128824788b36e2b1552b375a8e4381ce32d3429a88e7626670712
font_01_sfnt_off0000ea47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA47 10864 bytes
SHA-256: 22ffaed469595dc8e95af7647485a78ba4d6e8ba6e7f6710c81ff96632b84767