Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a85b0e2309b2002…

MALICIOUS

PDF

80.3 KB Created: 2021-05-03 13:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a4f745a7c33a0f9823451cca71e665ad SHA-1: 745b21afe1b4da302794ee2b96496485c0cbaaa8 SHA-256: 1a85b0e2309b2002f43a142c87927b43ab82568bd8fe4a3dd95faed52a980ecc
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users. The document body, though heavily obfuscated, appears to be a lure related to a common search query, suggesting a phishing attempt to trick users into clicking malicious links.

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://golowaki.ru/strik?utm_term=how+do+i+change+my+reebok+treadmill+from+km+to+miles PDF link annotation
    • http://wirelessinfo.ru/biomaterials_the_intersection_of_biology_and_materials_science_1st_editionnukse.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484835/normal_6016c3e01fa87.pdfIn PDF document text
    • http://koprovk.xyz/388787397614iy8d.pdfIn PDF document text
    • http://wolifote.getenjoyment.net/4638660822.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501356/normal_5ff428b24a407.pdfIn PDF document text
    • http://tupaxeguna.scienceontheweb.net/7562046011.pdfIn PDF document text
    • http://ladiluvame.mypressonline.com/biografi_imam_bukhari.pdfIn PDF document text
    • http://es50off.pro/english_grammar_book_for_kindergartenvptn6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421058/normal_5fdc3701d93bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370785/normal_60194fbe1a715.pdfIn PDF document text
    • http://teksalle.xyz/2004_dodge_ram_2500_parts_diagramn1gll.pdfIn PDF document text
    • http://tarigutese.mygamesonline.org/woxegejerozalo.pdfIn PDF document text
    • http://idealica-it.website/expanded_form_worksheets_for_1st_grade25ijc.pdfIn PDF document text
    • http://bred-enligne.com/food_label_template_for_buffet_tablettv8m.pdfIn PDF document text
    • http://jabilevij.mypressonline.com/akin_to_anne.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zepuwiz.atwebpages.com/25065644428.pdfIn PDF document text
    • http://pewubik.atwebpages.com/citation_apa_6th_edition.pdfIn PDF document text
    • https://b6086c54-8ef4-40f3-ba18-bbbb993b339e.filesusr.com/ugd/36e927_331d2feefb3e4375a250b3f2e40faabe.pdf?index=trueIn PDF document text
    • https://ca06489b-9cc7-4d60-8424-05bb9d91883a.filesusr.com/ugd/35b1aa_cbad8e3a44f345dd94e3bdf7b3e0239d.pdf?index=trueIn PDF document text
    • https://238a82c5-85a8-4641-a991-2f0f5270ddc4.filesusr.com/ugd/63f22d_c038c6295afb4e28ab3cd7b2f3568b7f.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF13 2900 bytes
SHA-256: b3dfb2f2c41da7350fc3755141d2fd0ea5796bb125df25fec831093623ff73df
font_01_sfnt_off0000f956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF956 5796 bytes
SHA-256: d1596824fa29d1973a008911d56575f24cb6eba59cb0a7f627579e481d81129c
font_02_sfnt_off00010cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF9 10692 bytes
SHA-256: 5dd6f3407ab854da67839e4817c315d6d954748b87e978e06c88dcc02a3d2bc6

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