Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac6c785a71e39a6…

MALICIOUS

PDF

76.3 KB Created: 2021-03-09 09:26:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdd8df3af5e860303a1d3008a9c85877 SHA-1: bc7c675deccf7b52118bf7ddae80abd5fb26d61e SHA-256: 1ac6c785a71e39a6200e995a64207029407841b4c4fa84a732c57b9085fba20a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which are dynamically generated and point to potentially malicious domains, suggesting a link farm or phishing operation. The embedded URLs and the overall structure point towards a spearphishing attachment used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/wix?keyword=psychology+an+exploration+canadian+edition+pdf
    • https://cdn.sqhk.co/boxepupovemu/QidMjdS/rise_of_skywalker_general_hux.pdf
    • https://zazokovorif.weebly.com/uploads/1/3/4/3/134321981/mudulajatuza.pdf
    • https://cdn.sqhk.co/tororukiwuri/jgjjgiP/67652423524.pdf
    • https://dewufore.weebly.com/uploads/1/3/4/8/134857007/novex.pdf
    • https://cdn.sqhk.co/xakalodesi/ikjgjCS/vedelatakulupezevokuf.pdf
    • https://rinafudafize.weebly.com/uploads/1/3/5/2/135293322/sigivotizotuzigika.pdf
    • https://mubixanoderonus.weebly.com/uploads/1/3/4/8/134871639/pevaw.pdf
    • https://natapuwofase.weebly.com/uploads/1/3/1/8/131857101/e9018.pdf
    • https://cdn.sqhk.co/kurinunuwor/hhhfCra/2592867482.pdf
    • https://jazelisis.weebly.com/uploads/1/3/4/8/134870131/kipafotudu-pafemozu.pdf
    • http://banademebilite.sportsontheweb.net/nimuva.pdf
    • http://winovigamaj.mygamesonline.org/2013_dodge_avenger_3.6_oil_capacity.pdf
    • https://muwegegedagus.weebly.com/uploads/1/3/0/7/130738526/lijotogegevexa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4b67404f-136a-46a0-9cf3-151f2d38faab.filesusr.com/ugd/241fd5_0015d1f32c6743e5adb3e669d74ef554.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6d362a59-edf0-4c74-a97d-09bea45bf866/vizio_vw26l_stand.pdf
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_01d246f019794c2b88d7a2dd0de1eabb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cfd2ecf7-e91c-498c-8eb6-48b7756480ff/12402119918.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edae.bin
f02798feb5884fe1f30cc82f7c1285ff4d6248c97b9ae17960edd9730a074f12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAE 5588 bytes
font_01_sfnt_off000100ba.bin
a445481b72dd423829aebe6b304d3d71da4f38b7b9be444d0399ff75cce5bf76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100BA 10336 bytes

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