Malicious PDF — malware analysis report

Static analysis result for SHA-256 280554a6e4de2e53…

MALICIOUS

PDF

120.1 KB Created: 2021-04-07 09:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c5c065665cc1388c7484bb822307f171 SHA-1: 4d3efd3d1b770f166d42b1ecf8ff88eeaf58065f SHA-256: 280554a6e4de2e538bb33fbeaef922099acec04978402440add372938953d817
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation scheme. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malicious redirection attempt, potentially leveraging embedded JavaScript for obfuscation or further redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=2011+ap+statistics+free+response+answers+a+professional+sports+team PDF link annotation
    • http://lerob.info/bluedio_t2_bluetooth_5.0_headphones_with_mic1uy77.pdfIn PDF document text
    • https://cdn.sqhk.co/jabisopomuxo/ebALWxo/2151844819.pdfIn PDF document text
    • http://terem.space/logunonojazifotifuzuj95h1p.pdfIn PDF document text
    • http://erogan24.website/sony_str-dh520_specsrtq1s.pdfIn PDF document text
    • https://cdn.sqhk.co/busumodofu/CibAjgh/26005620434.pdfIn PDF document text
    • http://itdomen.fun/8385302813234xd1.pdfIn PDF document text
    • http://insta-sale.site/4461809966ue9st.pdfIn PDF document text
    • http://netzamka.ru/39851259775m5cwm.pdfIn PDF document text
    • http://copyright-help-report.com/frigidaire_gallery_large_room_70_pint_capacity_dehumidifier_with_wi-fi633lm.pdfIn PDF document text
    • http://trydouche.xyz/67768683557uc5p8.pdfIn PDF document text
    • http://opensoda.pro/36416331594h0ie6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_087b9cc22c10401096b37035b8e51768.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fe02994-907b-4888-af82-c9c30db11a52/best_end_fed_half_wave_antenna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d955206-229d-4f90-8329-edf21b609a5f/jvc_kd-s39_car_stereo.pdfIn PDF document text
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_f60602738e2744669b86ad67c3c37c6f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/17e1469a-d601-442c-98dd-c50562055630/fofikikebipaxogutiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41347ab5-5fed-49c6-b872-6a218c156939/30206361712.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29b797ba-b261-4aff-b222-dc67af4a85c4/tapuripole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1a1c22d-651a-4e89-909e-7a50de8fe4e6/xevuw.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_off00019861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19861 5484 bytes
SHA-256: e60f1b03b707f67d942b8cff65532d37808ff6d7cd2f22bd188760a31a6f25df
font_01_sfnt_off0001ab0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB0A 11540 bytes
SHA-256: a474fc2bf71745c60ce55d39c26f0737d56bc93721d1a775d7037587a8d27c98

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