Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9a88760ab5dfe9…

MALICIOUS

PDF

74.8 KB Created: 2021-03-11 05:43:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e782b210a109a06c512e2fb37cf8f7f8 SHA-1: 1487b336c3fce3f918835ca46d737f7f56a278c8 SHA-256: 8c9a88760ab5dfe9ad48684ac22c0bca795cd8924df2b1059f712196c4c8e8d6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to lead users to potentially harmful content.

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://lozipotod.ru/award?keyword=streamline+english+departures+pdf+download
    • https://xitesinunupur.weebly.com/uploads/1/3/4/3/134318791/sagisogazed-siwebovuke-jizidenakus.pdf
    • http://mavito.online/ruzawukojapixodousii9.pdf
    • http://prostosite.site/is_it_disrespectful_to_get_an_om_tattoot13lc.pdf
    • http://linukevaduze.iblogger.org/dominos_allergen_information.pdf
    • https://cdn.sqhk.co/libuzewis/hchjMje/palozobaliti.pdf
    • http://lokotahas.ru/how_to_become_an_internal_auditor1sg8c.pdf
    • https://duxoberadu.weebly.com/uploads/1/3/4/7/134718286/0b32454.pdf
    • http://delayikapy.xyz/is_qled_tv_better_than_4k9tyrq.pdf
    • https://cdn.sqhk.co/pujixefan/gdggKed/pakigo.pdf
    • https://cdn.sqhk.co/najafizox/eqjaiar/christmas_bowling_event.pdf
    • https://wupibivuvofat.weebly.com/uploads/1/3/1/1/131164023/jiwego.pdf
    • https://cdn.sqhk.co/madufuxenuw/3dKqwhj/5809803819.pdf
    • https://niregesop.weebly.com/uploads/1/3/0/7/130776037/telasevilarelapaxizu.pdf
    • https://mutikotamibe.weebly.com/uploads/1/3/0/8/130874320/1055688.pdf
    • https://cdn.sqhk.co/lekusovu/jgHOWtC/who_moved_my_cheese_lessons.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://wetafemef.epizy.com/mivuki.pdf
    • https://uploads.strikinglycdn.com/files/0d5f1bad-f63a-4c68-9daa-426b85a9d386/simaziburuwivojif.pdf
    • https://uploads.strikinglycdn.com/files/a5c19803-b5ac-4009-805f-f5324449dcbe/wuzajenazeki.pdf
    • https://uploads.strikinglycdn.com/files/ec9c0bfd-cffd-4e9c-8946-3819b45bbf3d/lanuruvopotoferuguba.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9f6.bin
df453bc9f7cff934011ffd1a5975a78c488999199b849ba520f0522e2f249107		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F6 5532 bytes
font_01_sfnt_off0000ec9a.bin
94b2382a2179b4a0ac4765fa4230401c9b0816f2b66a44a5c3b695e12b3f4ed4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9A 10196 bytes
font_02_sfnt_off00010f88.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F88 4324 bytes

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