Malicious PDF — malware analysis report

Static analysis result for SHA-256 15ea560d03390e37…

MALICIOUS

PDF

76.1 KB Created: 2021-04-08 07:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d069cb8bd68889d6dfab9598c667cd82 SHA-1: fa34c93de183c96cbf42a44563cf1f7ef53c50bc SHA-256: 15ea560d03390e37a798408c18d100446c149c92933d0514d40e38e7b124076a
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to 'worksheet answers', which is a common tactic for phishing or malware distribution. No scripts were extracted, but the presence of external URIs and the link farm heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

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 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://kuzutuzo.ru/wix?keyword=identify+the+absolute+value+function+worksheet+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4468814/normal_5fc5b4a1715ac.pdfIn PDF document text
    • https://cdn.sqhk.co/guxifunuris/khhpQgc/downy_wrinkle_spray_australia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421333/normal_605501df5ef1f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412183/normal_5fc60da977655.pdfIn PDF document text
    • http://bapatavusirave.mygamesonline.org/how_much_does_it_cost_to_get_unlimited_data_for_att.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485711/normal_5fee63fa9297d.pdfIn PDF document text
    • https://medefidonirefej.weebly.com/uploads/1/3/5/3/135324812/birufuluxa.pdfIn PDF document text
    • https://cdn.sqhk.co/vinasujitupe/kBigJtd/tujot.pdfIn PDF document text
    • https://nasaperexi.weebly.com/uploads/1/3/5/3/135351481/bulop.pdfIn PDF document text
    • https://cdn.sqhk.co/nifodotiriru/gjiazMK/tasiwarusinanoxidosi.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/e1215455-78bc-4269-91d9-09b01e20332e/79623995477.pdfIn PDF document text
    • http://xoxigibutu.epizy.com/telesis_tmp1700.pdfIn PDF document text
    • http://mozolawaguj.epizy.com/how_many_scoops_of_coffee_for_6_cups_cuisinart.pdfIn PDF document text
    • http://muwovulal.epizy.com/37486243172.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bea8653-7b24-4414-9292-e0a542168e46/what_does_rule_8.1_hearing_mean.pdfIn PDF document text
    • http://kamigawox.atwebpages.com/lomosejo.pdfIn PDF document text
    • http://kejagabato.myartsonline.com/wicca_a_year_and_a_day_timothy_roderick.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_off0000eaf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF0 5504 bytes
SHA-256: ed48ee3d775674af2602a499884e6cfcc50dd9e2b97b637b3c54a73f6118239e
font_01_sfnt_off0000fdbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBD 10800 bytes
SHA-256: 6ab6308a7cdd11d37251aa27d7e4cbc5de626072432d51650c63e5797f8eea24

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