Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b159dce1ab9dce2…

MALICIOUS

PDF

75.2 KB Created: 2021-04-06 20:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 304f257f892cbcd02f7cdb16e3793dba SHA-1: 1d177fd974295c2d4e052297da80e3595e104446 SHA-256: 3b159dce1ab9dce2ae8bd7cb77576ef8e27e77f138d81220d4bc2ff471779674
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=strong+acid+weak+base+titration+pdf In PDF document text
    • https://fiwixenolo.weebly.com/uploads/1/3/4/4/134493020/lenisepepezunob.pdfIn PDF document text
    • https://paxituzupinemof.weebly.com/uploads/1/3/5/3/135303349/f21df6757.pdfIn PDF document text
    • http://wifisef.medianewsonline.com/71762384609.pdfIn PDF document text
    • http://rejamar.sportsontheweb.net/83046160524.pdfIn PDF document text
    • http://winatesef.sportsontheweb.net/bovofejokalodif.pdfIn PDF document text
    • https://zuxosudeti.weebly.com/uploads/1/3/4/3/134359900/2790193.pdfIn PDF document text
    • http://huaweistoreukr.xyz/if_two_players_have_full_house_who_winsax5ei.pdfIn PDF document text
    • http://pomirkapa.site/batzal_roof_designer_3ds_max_2014lu8ga.pdfIn PDF document text
    • http://dokojekiferej.mygamesonline.org/84696329357.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/312aa92c-8b4b-435f-a56c-c1226f08c4f4/golds_gym_exercise_bike_300_ci.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d4134b9-e572-4a2d-8c58-f99b20c3188c/mevajokukopukalurikuga.pdfIn PDF document text
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_d33e935e47764db5ba630ec0303eeca6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6b912be-fd7a-4bb6-9a28-6024239b11b1/ribozudowomogukuvosav.pdfIn PDF document text
    • https://ba85394b-11ac-4ca4-926b-74ca936c52e1.filesusr.com/ugd/5ccfc8_ef5ddb0874e64d94938108512df63fcb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1d7ac2e-4e36-4349-985a-22dbe92f0a77/7850473153.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca4ef1db-737b-4d58-b292-f8732705a9c1/how_to_write_a_speech_grade_5.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_off0000e9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B9 5688 bytes
SHA-256: b139c9d631c48258302616748cfd65430457ea21b1859978368b891a16d16900
font_01_sfnt_off0000fd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3B 10152 bytes
SHA-256: 54fa253bb7d6a6660c758881c81e2db28098fd489c1f663eb72b1e67eabc8530

Open this report in the interactive analyzer, or submit your own file for analysis.