Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f6cf7f13fc7682…

MALICIOUS

PDF

75.6 KB Created: 2021-03-12 07:46:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1831843cad6a5e06e3bd478a89f4df32 SHA-1: 34e3c2de4b94fceb5c44891a42b96cd2bb76ea27 SHA-256: 33f6cf7f13fc76828c23893613ea9b20d914d61e4427794dd894d48ec8597101
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://jumiwimov.ru/strik?utm_term=rare+genetic+mutation+lung+cancer PDF link annotation
    • https://cdn.sqhk.co/fogibadeku/VhjC8hf/hunter_assassin_hack_mod_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/penomufepuk/ehhghHZ/xewibu.pdfIn PDF document text
    • http://kfnwejfnkwheklf.space/jepanofoknl7nv.pdfIn PDF document text
    • https://cdn.sqhk.co/tunuviju/Shc14is/angry_birds_pop_mod_apk_2020.pdfIn PDF document text
    • http://creampiepow.club/lenovo_y500_laptop_price1tiv0.pdfIn PDF document text
    • http://xebiniseba.mygamesonline.org/caesura_in_beowulf_with_line_numbers.pdfIn PDF document text
    • http://onlinesos.tech/80012916094eleb2.pdfIn PDF document text
    • http://vykupavto54.ru/38440706596rzrv3.pdfIn PDF document text
    • http://navevukosuso.mypressonline.com/24166019447.pdfIn PDF document text
    • http://eyebrowthreadingdallastx.com/401623659535sku2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zegetafirotazaz.atwebpages.com/bijodukerovemukifejutidop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9641c7c8-0054-4d05-85ef-89688b9f7bd0/maytag_centennial_dryer_manual_medc300bw0.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/11958934372.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/retail_marketing_books_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/32855239689.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23ce80bf-fa95-4b1e-bde1-0da55571b055/jawbone_jambox_charging_port_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4be6047-d55a-4108-bda8-0d51d5792309/control_bluetooth_speaker_volume_with_tv_remote.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/basedepexadu.pdfIn PDF document text
    • https://78bdfa25-736e-4945-a764-db21511aacb9.filesusr.com/ugd/9bd82e_9f9f0b7b205644aab0612d9f9f070b3d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/624a7ec3-039d-46c7-bdfb-8f55f486b40d/bidesapoj.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/food_grade_hydrogen_peroxide_holland_and_barrett.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f98f03c-ff63-45f6-9f86-e636a6d65135/methods_in_stream_ecology.pdfIn PDF document text
    • https://dacf5b84-f80e-4bd8-bb7f-22aad20a1cd8.filesusr.com/ugd/285be4_350423e83038499cbdb574a92c8576d3.pdf?index=trueIn PDF document text
    • http://jisunopesaluzi.atwebpages.com/what_is_lean_in_agile_methodology.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_off0000ec7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7A 4948 bytes
SHA-256: 3f70a145863673dac1b377eea10faca698bad6572d051126bc8546caf3787c3d
font_01_sfnt_off0000fd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD43 10500 bytes
SHA-256: 72cd0e96088a93bbcc3eda25f62d1b5f3eb629c94920c75d79b2c5cedd87c672