Malicious PDF — malware analysis report

Static analysis result for SHA-256 38de28d028fe84b9…

MALICIOUS

PDF

74.8 KB Created: 2021-02-24 04:29:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 684b937720822fb44651712c5d42b1c8 SHA-1: 0097ed47b9363f5e6d4746ebf6a6d15ce8f79b0d SHA-256: 38de28d028fe84b9f569b5e8b9e838563ebb48d2859304865daf551573f1c3a1
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains or potentially malicious hosting, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links suggests a phishing or SEO spam campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://leonvi.ru/wix?keyword=the+best+of+spyro+gyra+pdf PDF link annotation
    • https://cdn.sqhk.co/fivodewile/jjfQcKk/xfinity_stream_on_firestick_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/kizajituxab/hfsdihr/11382020158.pdfIn PDF document text
    • https://rodamopuxex.weebly.com/uploads/1/3/4/3/134354351/zarux_vazarumotoror_vewewuj_fakiwelafevop.pdfIn PDF document text
    • https://cdn.sqhk.co/boguzivipel/qlsRgiB/45396819706.pdfIn PDF document text
    • http://poopo.ru/97300216501urtxp.pdfIn PDF document text
    • http://bufenukaje.22web.org/10425159460.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwufupi/jbsj0ge/92305122728.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446647/normal_60264cf51b8f9.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxowowi/gifOYhj/koala_kare_kb200-_00-_inb.pdfIn PDF document text
    • http://findattime.com/251422558567wm8b.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://sasoregasot.epizy.com/metformin_er_vs_ir.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/word_game_answer_4_letters.pdfIn PDF document text
    • http://jojisoxig.epizy.com/4879806152.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/10353672783.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD6 5096 bytes
SHA-256: 871f6162546e2669f41b947a76170d8b6857dcf9b535b406aecdb45d72a741b5
font_01_sfnt_off0000ed3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3E 10212 bytes
SHA-256: b35e941798bb155fc275173813e5fe76b752bcecfbbf2e5a90295aa7a8f29fbb
font_02_sfnt_off00011048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11048 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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