Malicious PDF — malware analysis report

Static analysis result for SHA-256 a994344350b2e6af…

MALICIOUS

PDF

78.9 KB Created: 2021-04-10 18:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: cd87e125665201742682e42164ac69c1 SHA-1: 787537f7bbfe082e4169a85ba4c7f3d653cbd784 SHA-256: a994344350b2e6af155b0838b7f617a0ec272c45b4297c1f0fcb4082ba80eaa4
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URIs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://botokaw.ru/strik?utm_term=wix+insert+header+code PDF link annotation
    • http://zumanidoxup.medianewsonline.com/the_girl_in_the_ice_robert_bryndza.pdfIn PDF document text
    • http://rajajime.mypressonline.com/steinway_baby_grand_piano_price_uk.pdfIn PDF document text
    • http://gabukamapomife.22web.org/addams_family_musical_sheet_music.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://valunat.rf.gd/tudugamenisufukasufofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34d4d81c-3a3e-46db-b501-1bc627302ee7/18717163491.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45405f5d-f6f0-4bbe-af55-259b69de9797/pavoxoratowefusupuve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c32b9feb-6fbf-49a4-830a-5e3548f6781d/daxibowugos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aeee3b1-941e-4f51-819e-f271c2d42ed9/how_to_trade_in_stocks_jesse_livermore.pdfIn PDF document text
    • http://wutesejib.onlinewebshop.net/kaworadonovedevexunugale.pdfIn PDF document text
    • http://vadibezodaxilez.rf.gd/schubert_liszt_ave_maria_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b94402e-55a4-4862-9368-9d038095a59b/pisexiwed.pdfIn PDF document text
    • https://fa5d8e44-005d-4c05-925d-ba60cb7f5023.filesusr.com/ugd/121e37_8a7a190a2c2645fe909bcd1177806729.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/chennai_express_3gp_movie_for_mobile.pdfIn PDF document text
    • https://78de399b-5cb1-4d05-8290-e7933402b20f.filesusr.com/ugd/10f998_89fc8bae12a046fd967ba1ae8cdff512.pdf?index=trueIn PDF document text
    • http://polodosoxej.rf.gd/think_and_grow_rich_the_legacy_full_movie_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/shuffle_beat_drum_sheet.pdfIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_e30fcdd2f0c44529b20fbce5336c8873.pdf?index=trueIn PDF document text
    • http://zitawajizotifam.epizy.com/venovusadudajusavo.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/singer_quantum_stylist_9960_price_in_sri_lanka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/822eceb2-5341-4010-b788-941c7c18c427/motes.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/mifezenovefemuwi.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/63753992119.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_off0000f600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF600 5076 bytes
SHA-256: 616e67f5290a7231e6f1407b03f40eb492ec350ee40cb862d5e2debf9c9901f0
font_01_sfnt_off0001074c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074C 11292 bytes
SHA-256: 5783633c7e769dafadc1a5fe9c0952790f89f5db83c8ddae2b602b1089be1f2a