Malicious PDF — malware analysis report

Static analysis result for SHA-256 7888e760f407055e…

MALICIOUS

PDF

78.5 KB Created: 2021-05-16 10:34:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 22f2791e823a2b94427fd5e86f954b74 SHA-1: 10c7f128db4d1a16ff27a4b6b2aba0dcc97e36a4 SHA-256: 7888e760f407055e49f0169dec95f8f62d165f9bddc03acf21428adef8a83227
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('vilenefex.ru') that is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to 'first aid usmle step 1', suggesting a lure to attract victims interested in medical studies.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://vilenefex.ru/strik?utm_term=how+to+use+first+aid+usmle+step+1 PDF link annotation
    • https://cdn.sqhk.co/jesuzedavoti/GQifbae/bootcamp_windows_10_64_bit.pdfIn PDF document text
    • https://cdn.sqhk.co/nasanoroge/ZFdieia/72634590350.pdfIn PDF document text
    • http://linoveda.22web.org/thermal_insulation_sheet_material.pdfIn PDF document text
    • http://vanlit.ru/why_do_smoke_alarms_keep_chirping4wobz.pdfIn PDF document text
    • http://aicberg.net/when_to_perform_canonicalization_of_input_dataeqtpc.pdfIn PDF document text
    • http://romigeguwapefi.22web.org/38489799659.pdfIn PDF document text
    • http://mon-compte-cmb.best/zonewegaqwwwn.pdfIn PDF document text
    • http://werenntaq.online/schwinn_s_25_mountain_bike_manualwigt0.pdfIn PDF document text
    • https://cdn.sqhk.co/vugomupuzisa/hgjRqha/zuwezot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xadeboni.epizy.com/uniforme_escolar_uniforme.pdfIn PDF document text
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_4943fc843df2451a85bfa70529886d0e.pdf?index=trueIn PDF document text
    • http://jegegapi.rf.gd/angular_7_form_set_value.pdfIn PDF document text
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_1578a77c29d3441cbf18d8badf72d92a.pdf?index=trueIn PDF document text
    • http://mowesedapi.epizy.com/higher_secondary_examination_2019_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ab5db99-abf6-42f0-a7b2-0e15bc53efd4/40013364187.pdfIn PDF document text
    • https://eda93683-a6ca-45e9-8056-ca7adea7f1dc.filesusr.com/ugd/d655db_1c020f59219144cca1236ed96d154d93.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/df50960d-2e96-481d-8438-e820990b1178/19918543744.pdfIn PDF document text
    • http://webuwerogoken.rf.gd/dragon_age_inquisition_iron_bull_approval_guide.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_off0000f242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF242 5292 bytes
SHA-256: 82df8d405e193ef35038199f341d8f4cebf74a45e9214c5552040a69d5918b37
font_01_sfnt_off0001043e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043E 11472 bytes
SHA-256: a09f0874458ccdd7d37f396f4634417d4af23cc28b08b30c5a0029151489501b

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