Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1088c05fa31ece2…

MALICIOUS

PDF

77.2 KB Created: 2021-01-21 12:46:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b50897a29b956a2483b93630ddffd7e5 SHA-1: 71dd2d033ab7c769bb74432be70076deeb4d81e4 SHA-256: e1088c05fa31ece213e36168cdee6473852a046ba4c9b90c02f0f8ac7e84503b
184 Risk Score

Malware Insights

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

The PDF contains numerous links, with a critical heuristic firing indicating it redirects to known malicious infrastructure. The document body, though heavily obfuscated, contains text that appears to be a lure for a song download. The presence of embedded URLs and the ML classifier's high confidence score support the assessment of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://yafferge.ru/aws?utm_term=bhai+bhai+song In PDF document text
    • https://site-1179282.mozfiles.com/files/1179282/ragdoll_engine_fling_push_script.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366405/normal_5fe549a489110.pdfIn PDF document text
    • https://site-1168125.mozfiles.com/files/1168125/spacedraw_download_for_pc.pdfIn PDF document text
    • https://site-1171847.mozfiles.com/files/1171847/assault_on_a_police_officer_sentencing_guidelines.pdfIn PDF document text
    • https://site-1190022.mozfiles.com/files/1190022/steel_ball_run_30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506170/normal_5fda00349c54b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401515/normal_5f9f946b4701b.pdfIn PDF document text
    • https://site-1209079.mozfiles.com/files/1209079/86903020508.pdfIn PDF document text
    • https://site-1173634.mozfiles.com/files/1173634/pico_iyer_book_review.pdfIn PDF document text
    • https://site-1084247.mozfiles.com/files/1084247/depujefobabakutozuvow.pdfIn PDF document text
    • https://site-1084156.mozfiles.com/files/1084156/collagenase_ointment_davis.pdfIn PDF document text
    • https://site-1166704.mozfiles.com/files/1166704/spiral_wound_gasket_types.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388619/normal_5ff190dcb8f71.pdfIn PDF document text
    • https://site-1175494.mozfiles.com/files/1175494/walker_clinical_pharmacy_and_therapeutics.pdfIn PDF document text
    • https://site-1245874.mozfiles.com/files/1245874/jumble_answers_for_7_9_19.pdfIn PDF document text
    • https://site-1253065.mozfiles.com/files/1253065/90665483008.pdfIn PDF document text
    • https://site-1176797.mozfiles.com/files/1176797/nipigewisubakekutu.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/dutuzanob/dipelizagowavulapi.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/niveles_antigeno_prostatico_especifico.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/diablo_3_botting_guide.pdfIn PDF document text
    • http://sidijujaz.epizy.com/english_dj_dance_music_free.pdfIn PDF document text
    • http://zugodelojuj.epizy.com/786397773.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/camscanner_mod_apk_latest.pdfIn PDF document text
    • http://kenubuw.epizy.com/65675491006.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_off0000f059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF059 5008 bytes
SHA-256: dbb87ece19734230b27ad6327d4ba1ccdd19a1640f63635adb21f5a68b738ab5
font_01_sfnt_off00010164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10164 11196 bytes
SHA-256: 7c9c725e32135000bff41c677615384b6d3546872900f3977bb3d38abcdd3621