Malicious PDF — malware analysis report

Static analysis result for SHA-256 280f833cd76577ee…

MALICIOUS

PDF

81.7 KB Created: 2021-03-06 18:23:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: fe406f69b50dd54cba21ddbe71898601 SHA-1: 56d051570231e9bbd37f6cf0400aed000e08eebd SHA-256: 280f833cd76577eeceda1a3e9295ccabb618715c11fbeeee29d642444491c122
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URLs, many hosted on disposable domains and configured with UTM parameters, suggests a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://golowaki.ru/aws?utm_term=2019+ford+mustang+5.0+convertible+for+sale PDF link annotation
    • https://ravidaxixow.weebly.com/uploads/1/3/4/3/134315840/bemupipapar.pdfIn PDF document text
    • http://albatros-trans.ru/surah_mulk_textqja1p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475734/normal_602d252923b31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469860/normal_6032340b296ec.pdfIn PDF document text
    • http://rugegav.mywebcommunity.org/mapunozukegebufijomejeju.pdfIn PDF document text
    • https://cdn.sqhk.co/vivakawibaki/3egiJhh/xoduxepusuvibim.pdfIn PDF document text
    • https://cdn.sqhk.co/juzosugun/jjjbHhb/gang_clash_all_characters.pdfIn PDF document text
    • http://honbiz.pro/22885304114wb6pm.pdfIn PDF document text
    • https://jikegasabum.weebly.com/uploads/1/3/1/8/131856907/xabodar_niwezus_rikezuruganawan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417808/normal_6036f49688ce5.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/ie1eChd/kavujere.pdfIn PDF document text
    • https://nukijevexumi.weebly.com/uploads/1/3/4/7/134714394/c5e388345a09.pdfIn PDF document text
    • http://justiciaforjustice.com/82683594714cm8ko.pdfIn PDF document text
    • https://cdn.sqhk.co/resilano/bhEn0fX/76711033754.pdfIn PDF document text
    • https://wexaluzeneroxer.weebly.com/uploads/1/3/0/7/130776054/c2309b.pdfIn PDF document text
    • http://cleaner360.shop/misovogukudarologireboj5mq5g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475853/normal_602a9de2d0eb3.pdfIn PDF document text
    • http://roboludawu.mywebcommunity.org/binomial_theorem_calculator_symbolab.pdfIn PDF document text
    • https://cdn.sqhk.co/mudaxomemut/hfhgObb/65163774775.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402712/normal_5fed3119b0f65.pdfIn PDF document text
    • http://azules.ru/67120896189ajm5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/82a748eb-4c7e-4f1f-a8f1-9aa31556e2e6/5th_grade_essay_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9554525-bd1f-4fad-aa91-966f9a0c5b5d/is_netgear_n150_wireless_router_compatible_with_comcast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/205664c1-d5c6-4b00-ac0c-3f003761d15d/build_your_own_kitchen_breakfast_nook.pdfIn PDF document text
    • http://vugugemo.atwebpages.com/xudobiwofadugo.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_off0000ffcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCD 6084 bytes
SHA-256: a4ccf3ccb635152b83c65161790398074366d4a60f6fc087f6b7605a09b0a206
font_01_sfnt_off00011480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11480 10584 bytes
SHA-256: 1196b5d04253a35c0f17b04e15409595fb732d663ef827be8ee24e4ff08ecb4f

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