Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3522d56788ca6a0…

MALICIOUS

PDF

82.7 KB Created: 2021-04-10 07:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f7f7496ac8033bb22a0c840141980576 SHA-1: 7d39e985d6fffb0f174394b3c7bac2686036310d SHA-256: e3522d56788ca6a0792480a0da6ca22d95508fd7bba62f4917e477053188a02e
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting, indicating a link farm or SEO spamming tactic. The presence of the URL 'https://ponafet.ru/strik?utm_term=will+home+warranty+cover+old+hvac' suggests a phishing or redirection attempt, likely to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ponafet.ru/strik?utm_term=will+home+warranty+cover+old+hvac PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4498645/normal_5fd982f96401d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422638/normal_6024564b3c855.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401703/normal_6061936057b4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428054/normal_606ac8f4e1110.pdfIn PDF document text
    • http://3203epworthcres.com/ps_i_still_love_you_3i3t2r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369493/normal_60611eb30c5a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388065/normal_6009cdf913b5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413719/normal_5ff50e173ac0f.pdfIn PDF document text
    • http://zathkatow.xyz/xerox_versant_180_press_service_manualz66wz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459035/normal_6044bbc0a74e3.pdfIn PDF document text
    • http://kpupnov.pro/joganop2tco.pdfIn PDF document text
    • http://msertis.xyz/851339993176o9io.pdfIn PDF document text
    • http://ig-verifiedsbadge.com/lucent_english_grammar_part_2qhu3u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9f5bcc56-a059-4f00-ae85-604acd6a3d2d.filesusr.com/ugd/ac9354_6324950ad1294c339c8f28fc2f282ff2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7748aee-9b48-41a8-8949-50806ea6f14b/how_to_learn_korean_language_words.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/how_to_draw_anime_guys_hairstyles.pdfIn PDF document text
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_6ae6473584f64454bf36a32e002b80e8.pdf?index=trueIn PDF document text
    • https://0f7a2101-273c-4f7f-b1fd-079d1ad923c1.filesusr.com/ugd/a7ea6f_27f18b4ebfdc460ea33a68dd91ae7a34.pdf?index=trueIn PDF document text
    • https://0bdb67af-4c57-4a6e-9706-714cc80719f5.filesusr.com/ugd/fc840b_5cbfb07419db4e848a556c7ef4942601.pdf?index=trueIn PDF document text
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_1f20a55743c943e8a8012a1f87894a1e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dc09761-730b-40f3-9d88-95663902131c/95283112017.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/circuit_wizard_library_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/what_is_the_best_version_of_strongs_concordance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f94ad1e7-a21d-43eb-9b96-70a90b4b3a61/dante_purgatory_canto_1_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/schengen_visa_application_form_filling_guidelines.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_off00010393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10393 5268 bytes
SHA-256: edebcff3cb477f6fcf5c8e9dd3088026ef669fc3803b5c0f707bd20bf65c9781
font_01_sfnt_off0001156b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156B 11184 bytes
SHA-256: 915b5f6a40ed25159c889e4575c7db5cb1d42069fd23c67af7d4f38cb42d15b2