Malicious PDF — malware analysis report

Static analysis result for SHA-256 32c0a574223846b6…

MALICIOUS

PDF

92.2 KB Created: 2021-04-09 06:41:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 31ea9612b4db3256a2c1579b0980778f SHA-1: 2048a1ec17a6ab3be2e7caaaf9e254d4ae1efe76 SHA-256: 32c0a574223846b655285b65151d087af1dac2c4219a6a1294d1191ba7ed08d4
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 threat. It contains multiple external URLs, with a primary one leading to a suspicious domain that appears to be a redirector. The document body, though heavily obfuscated, suggests a lure related to an audiobook, aligning with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic which identified a link farm on disposable hosting. No scripts were extracted, but the presence of external links and the nature of the heuristics strongly suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jottigo.ru/strik?utm_term=harry+potter+y+la+camara+secreta+audiolibro+voz+humana PDF link annotation
    • https://cdn.sqhk.co/giganopof/wiihBii/43116995127.pdfIn PDF document text
    • http://karaulovlife.site/xakapufusupalefategomavukms9r.pdfIn PDF document text
    • https://zakazorexan.weebly.com/uploads/1/3/1/4/131407051/1691e16.pdfIn PDF document text
    • http://trixy-matrix.space/paco_el_chato_tercer_grado_de_primariaiiuom.pdfIn PDF document text
    • https://vewenikeluw.weebly.com/uploads/1/3/0/7/130739128/xibaf_kafagagaw_goferutujem.pdfIn PDF document text
    • https://xekafifem.weebly.com/uploads/1/3/4/6/134669887/vafatu.pdfIn PDF document text
    • https://cdn.sqhk.co/vowibesep/S91HdKW/beurer_lightup_app.pdfIn PDF document text
    • https://cdn.sqhk.co/supetuzitepi/E1hjmgh/surah_ar_rahman_qari_abdul_basit.pdfIn PDF document text
    • http://natikolom.site/45622380350t2rcj.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/jggjgia/tachyon_rods_uk.pdfIn PDF document text
    • http://braco.ru/how_to_to_write_a_business_planuqn32.pdfIn PDF document text
    • https://derigogo.weebly.com/uploads/1/3/4/0/134017063/b0734756f486de7.pdfIn PDF document text
    • https://kunolutupevuj.weebly.com/uploads/1/3/4/7/134772201/f18815524b3a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6d5f85a-1446-4336-a91e-5a8cd796969d/literary_terms_metaphor_examples.pdfIn PDF document text
    • http://pipiwilevo.rf.gd/adverb_of_time_worksheet_grade_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88cc48b0-aa45-44b3-9ebd-5072271eab16/stick_and_rudder.pdfIn PDF document text
    • http://nuxotupasi.rf.gd/55992708091.pdfIn PDF document text
    • http://komukofebanukev.rf.gd/architecture_microservices.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bea4ac10-d7bb-4e62-a82f-49ebc0d4fa71/16408975772.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AC 6440 bytes
SHA-256: a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c
font_01_sfnt_off000103a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A0 5624 bytes
SHA-256: 8762ee45d64874c7fb6eb88aa05a72919011a59467815f81c8f038f72ddb27c4
font_02_sfnt_off0001169a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169A 3092 bytes
SHA-256: a3bd9986cbcb190e2db6a5ffe72c37500b0c2d55c5304dda2913320089cbbcf6
font_03_sfnt_off000122c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C1 12256 bytes
SHA-256: 44ea6a9bc75e45f27a068fb3d39e68a8c64fa77068d986386920fd2904863b7c
font_04_sfnt_off00014ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AC0 17036 bytes
SHA-256: 41b6ea3ee715ba68c0de56a031401b238c7c39b9bfe4eec7bd69abfa49ebdeee