Malicious PDF — malware analysis report

Static analysis result for SHA-256 4116542b365efd6d…

MALICIOUS

PDF

79.6 KB Created: 2021-03-21 08:38:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c37e68a96436eee90bc8e9f4bd32ecaf SHA-1: d290268d7c2b8490947d607d5adc0373e0743839 SHA-256: 4116542b365efd6dd07bc4bf6c1ff92329674a088f0a84da09efb929b698e2aa
194 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to drive traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the 'SE_DOWNLOAD_BUTTON' heuristic further support the attack pattern of luring users to click through to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=spider+man+unlimited+hack+no+survey+no+download PDF link annotation
    • https://cdn.sqhk.co/satovepato/RZQXtse/fire_and_water_5_ice_temple.pdfIn PDF document text
    • https://cdn.sqhk.co/xotakuzazuf/ighRFjf/simple_tabletop_christmas_decorations.pdfIn PDF document text
    • http://service-hire.com/letter_format_to_principal_of_schoolzi6ib.pdfIn PDF document text
    • https://cdn.sqhk.co/buvaboda/gjficih/geometry_dash_levels_1-_20_scratch_hacked.pdfIn PDF document text
    • http://arendaavto.taxi/canon_rebel_t5i_battery_charger5naut.pdfIn PDF document text
    • https://cdn.sqhk.co/zajujuva/gBhdhhz/characterization_of_nanoparticles_by_sem.pdfIn PDF document text
    • https://cdn.sqhk.co/lopijikuvi/wjgigii/ted_cruz_book_barnes_and_noble.pdfIn PDF document text
    • https://cdn.sqhk.co/jukapaba/brhfkXI/janapada_dj_songs_naa_songs.pdfIn PDF document text
    • http://fb-ig-violation.com/kujebaxugogusadamelxuxe.pdfIn PDF document text
    • https://cdn.sqhk.co/lagazowasobo/vqtugdn/54789455247.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xupiwepe.epizy.com/pioneer_sph-da120_bluetooth_problems.pdfIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_3527d11a36b641ac8d39749661e4c86a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bf45fbd-68ed-4aa5-acd7-09dfc78532a8/world_history_patterns_of_interaction_spanish_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f209fc58-1780-4400-8dcb-05210dbd29f4/jukamazokeso.pdfIn PDF document text
    • http://dajajubofu.rf.gd/nigerian_afrobeat_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abb6e385-e2a2-47b8-a7b6-97608030d5a1/are_washington_dc_museums_open_on_easter_sunday.pdfIn PDF document text
    • https://77cbb24c-feae-490b-854c-0a9d4db21a85.filesusr.com/ugd/3752ea_dd7faa8ae8564264a8986d4a5c064336.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c42d263e-bf8d-41c9-bbb2-34883666afb5/95370675784.pdfIn PDF document text
    • http://fosufikitovirir.rf.gd/pogurepo.pdfIn PDF document text
    • http://sasatabarodozow.epizy.com/crossword_jigsaw_app_answers.pdfIn PDF document text
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_b83387cda8f3429988025fdbba66507f.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80B 5732 bytes
SHA-256: 89f0b64b2a688ecbdcb28b3c963916329cb3b78b1d3ba65de3caaa7bac963314
font_01_sfnt_off00010b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B78 11136 bytes
SHA-256: 0d2e8b6ca4ec1a4d5bcdb5b63885f1a2104feac87e92a3fb725a5657c87528db