Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22b10ba1c196db9…

MALICIOUS

PDF

74.3 KB Created: 2021-03-21 08:57:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 8aca36aeaea0d8de3c8805361754d431 SHA-1: aa49bede803ad860664a41c6a9b2405b703be4c3 SHA-256: a22b10ba1c196db989380530b9d1ce4dc6b75010976718ae9eaceff60c8117fe
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to downloading an APK, suggesting a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation to execute a payload.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=twc+tv+apk+download In PDF document text
    • https://cdn.sqhk.co/rolileduvof/ohchemz/alchemy_symbols_and_meanings.pdfIn PDF document text
    • http://devlp.club/projectile_motion_lab_physics_with_vernier_answersvdi1n.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvinudubuno/gehg5ge/16688366302.pdfIn PDF document text
    • http://universityru.fun/46064446982f9pwe.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/cijjrij/yamaleela_movie_audio_song.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/65ihjh7/formula_for_area_of_a_circle_using_circumference.pdfIn PDF document text
    • https://cdn.sqhk.co/buvaboda/cHgfgs8/ruzifopopegos.pdfIn PDF document text
    • https://cdn.sqhk.co/nivatasob/crtbzzz/lucky_block_mod_minecraft_pe.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/iigEGhb/rush_rally_3_apk_download_uptodown.pdfIn PDF document text
    • http://gonaxepafa.iblogger.org/53192889267.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/bolovopizonuki/sisixanosedop.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/54143085505.pdfIn PDF document text
    • http://zitoxilafeguxu.rf.gd/artificial_intelligence_course_outline.pdfIn PDF document text
    • http://pozobopaxupuwu.epizy.com/nososura.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/disidatobetuweramojokemu.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/roriwarixozuvodasafifime.pdfIn PDF document text
    • http://nokigabexotuk.rf.gd/nixurumejafomedonudazav.pdfIn PDF document text
    • http://riwexakax.epizy.com/myocardial_revascularization_guidelines_2018_esc.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_off0000e6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DC 4960 bytes
SHA-256: 9cd1905398205b2e16315a8adf492047e0f2553894d8939d8d43bed9ac8b615c
font_01_sfnt_off0000f7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EE 10720 bytes
SHA-256: c3426c78d16f4a5c43d96fd6b98699505d68fbacf6b8d8c459ccbe2b6bb5e861

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