Malicious PDF — malware analysis report

Static analysis result for SHA-256 738ffcf2f21af6c1…

MALICIOUS

PDF

82.1 KB Created: 2021-02-28 00:48:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: bda97134192d7d5e6cb63a3ed7c934a6 SHA-1: 710a2565c3b44ee5c2098c12aece70578d754e37 SHA-256: 738ffcf2f21af6c1229c597c59da9972abf8bbe5ea983406f20d74000edd99d9
126 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs point to suspicious domains, and the document body, though partially corrupted, contains keywords related to calculator updates, suggesting a pretext for directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/award?keyword=how+to+update+ti-84+plus+ce PDF link annotation
    • http://vuxipoxo.22web.org/96964147603.pdfIn PDF document text
    • https://wosobariwosamu.weebly.com/uploads/1/3/4/3/134372044/04b0e89.pdfIn PDF document text
    • http://jekefidaz.mygamesonline.org/weniwirosites.pdfIn PDF document text
    • http://tidirakozodawon.getenjoyment.net/83817267846.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485570/normal_6033c7f8324ee.pdfIn PDF document text
    • http://pofuxubilet.sportsontheweb.net/how_to_thread_bobbin_singer_confidence_quilter.pdfIn PDF document text
    • http://rinujajija.getenjoyment.net/constructing_parallel_lines_worksheet.pdfIn PDF document text
    • https://kenojulovananav.weebly.com/uploads/1/3/4/0/134016885/nalomegutom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465133/normal_5feb8868d37a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446264/normal_602822887c7e9.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/photoshop_for_beginners_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379370/normal_5fe687d089c9f.pdfIn PDF document text
    • https://simazilojimi.weebly.com/uploads/1/3/5/3/135345327/vuliti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wugujub.onlinewebshop.net/93579831972.pdfIn PDF document text
    • http://pojozija.onlinewebshop.net/how_many_calories_are_in_burger_king_spicy_chicken_nuggets.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_off00010490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10490 5340 bytes
SHA-256: 6c61396e5e669d2014b071ae0f4cc44d3df1de43633f18c02efc52ceb2acb89a
font_01_sfnt_off000116ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EF 10660 bytes
SHA-256: dff25ad2356688feed9efe5fa20f04bc15cd8631061131d8eb53892bd61818e0

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