Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b3228b5dc0792b4…

MALICIOUS

PDF

92.5 KB Created: 2021-02-27 03:36:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f4f011d2eb79ea1dce88e9918131d473 SHA-1: 5f832e1ca27383e81e2e034ddfb6e20fc05d8be9 SHA-256: 3b3228b5dc0792b4865e08fc2bbdde7a3e14f5270dc97e6adef811d7ba05ae46
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm used for phishing or malware distribution. The document body, though partially corrupted, contains text related to learning programming languages, which serves as a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/strik?utm_term=how+to+learn+visual+basic+language PDF link annotation
    • http://pubgucbayim.com/scoop_it_up_minute_to_win_itmmqg8.pdfIn PDF document text
    • http://rowowevu.mypressonline.com/jessica_merchant_of_venice_character_sketch.pdfIn PDF document text
    • https://tirilume.weebly.com/uploads/1/3/4/8/134886795/varuvakapani_giwuvobopogud.pdfIn PDF document text
    • https://vimexizud.weebly.com/uploads/1/3/4/7/134755563/d72eb14ff6e.pdfIn PDF document text
    • http://gnfcns.info/is_the_witcher_tv_series_in_chronological_orderf9w3x.pdfIn PDF document text
    • http://doucheop.xyz/xufunovivumq1kt.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/world_map_blank_outline.pdfIn PDF document text
    • https://vewawunazesova.weebly.com/uploads/1/3/5/3/135314918/xiliwemutekitid_mefesozoga.pdfIn PDF document text
    • http://reactivaperu-viabcpi.com/tululebavodakivemadalo0zpkj.pdfIn PDF document text
    • http://kujunat.medianewsonline.com/6.0_powerstroke_ficm_repair_kit.pdfIn PDF document text
    • https://sexaxekeka.weebly.com/uploads/1/3/5/3/135313825/82a69281.pdfIn PDF document text
    • http://giwapozolaleg.mypressonline.com/90854195781.pdfIn PDF document text
    • http://beviluxenumiliv.mywebcommunity.org/fitafaxi.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/integrated_chinese_level_1_part_1_textbook_3rd_edition_simplified__traditional.pdfIn PDF document text
    • https://tipoxuxol.weebly.com/uploads/1/3/0/8/130814923/jeraluv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C41 5104 bytes
SHA-256: bb851b79ae1dc361aa815f78886c7c91bed786b27f34257796012bbab9a75e27
font_01_sfnt_off00012dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBC 11984 bytes
SHA-256: a077744d4ebe3f5394dd96b402eebf8e547501fbf92c3520cb694ea462dd0f77
font_02_sfnt_off000156ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156AB 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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