Malicious PDF — malware analysis report

Static analysis result for SHA-256 71bb4ca567e8433c…

MALICIOUS

PDF

77.7 KB Created: 2021-03-10 22:47:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 01f06e39b3cfa9f9de02a8f2cab3e51e SHA-1: bc1dcb67d41a49588fa2e17a3d45f5298541b646 SHA-256: 71bb4ca567e8433c41b2b3079ddf2353828b6a77659241b45e8c53c4d67b915b
134 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification strongly suggest malicious intent. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, suggesting it was generated programmatically to present deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://baarspo.ru/award?keyword=hssc+advt+15+2020+pdf PDF link annotation
    • https://cdn.sqhk.co/madumubo/7jiggIs/3d_maze_3_labyrinth_game.pdfIn PDF document text
    • http://idealslimitaly-ufficiale.site/el_ropavejero_cri_cri_letra6e3vb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453734/normal_5fc66fc65fc81.pdfIn PDF document text
    • http://4gusevshop.website/the_caves_of_steel_bookxg05y.pdfIn PDF document text
    • http://zexofezureza.iblogger.org/solarwinds_subnet_calculator.pdfIn PDF document text
    • http://zdorovie-vashe-vse.xyz/lejesimigegivobawah4um2.pdfIn PDF document text
    • http://helpforteam.com/669803738479lndl.pdfIn PDF document text
    • https://cdn.sqhk.co/kerametunal/chiib60/70528663532.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/nLhihjJ/sims_3_free_mobile_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384642/normal_6025dec6d2c4c.pdfIn PDF document text
    • http://itabody.space/cambridge_secondary_checkpoint_past_papersypbfp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383923/normal_5fe1ac2657f96.pdfIn PDF document text
    • https://nenejiremox.weebly.com/uploads/1/3/0/9/130969141/9405297.pdfIn PDF document text
    • https://nujetamewude.weebly.com/uploads/1/3/4/8/134881912/1974718.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495246/normal_5fc5e85898afb.pdfIn PDF document text
    • https://sokupime.weebly.com/uploads/1/3/3/9/133999930/8189189.pdfIn PDF document text
    • https://cdn.sqhk.co/tobijoge/hlijogi/73843457062.pdfIn PDF document text
    • https://bukodebavuv.weebly.com/uploads/1/3/4/6/134657655/6457277.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bikinegisuzuse.rf.gd/how_to_test_ac_high_pressure_sensor.pdfIn PDF document text
    • http://bimumebuzof.epizy.com/assassin_s_creed_unity_game_for_android.pdfIn PDF document text
    • http://jasosuwer.epizy.com/25696514071.pdfIn PDF document text
    • http://ruvesigokusi.epizy.com/kumesilaniforunenuju.pdfIn PDF document text
    • http://zusodufibixabut.rf.gd/46548662812.pdfIn PDF document text
    • http://vopuxoke.epizy.com/tepebog.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_off0000f316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF316 5492 bytes
SHA-256: f29f804c2d63af61d73f0db23c2dded2c1f18863d57a798ca5b6882fe72a5112
font_01_sfnt_off000105ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EE 10420 bytes
SHA-256: 445801e080da7916fbb7fb7859326718afc4d77e47b97036ce9bd8cd1eb5257b

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