Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a70d883f2889ab…

MALICIOUS

PDF

70.1 KB Created: 2020-12-18 12:07:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: eefc421eca4d330d4de5e98fde73873e SHA-1: c0d04f4c86c5bb4ed5282cd07a3fbce622a4981b SHA-256: c5a70d883f2889ab976a83155295780450b826988be61ba22308a9540a77c1db
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with critical heuristics indicating it functions as a redirector to malicious infrastructure. The ML classifier and ClamAV detection strongly support its malicious nature. The primary purpose appears to be directing users to potentially harmful websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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://traffking.ru/strik?utm_term=tribit+xsound+go+manual In PDF document text
    • https://wikukexinuxox.weebly.com/uploads/1/3/4/3/134349372/duganupereketajofe.pdfIn PDF document text
    • https://vogoworelo.weebly.com/uploads/1/3/4/2/134266182/8cef7.pdfIn PDF document text
    • https://podozipejubepa.weebly.com/uploads/1/3/4/8/134893890/giwolewip-kibifur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463010/normal_5fa7f24f514c3.pdfIn PDF document text
    • https://fifubinagate.weebly.com/uploads/1/3/4/8/134854053/gumifobibodotu.pdfIn PDF document text
    • https://bawokotofebadu.weebly.com/uploads/1/3/4/5/134507933/vawadug.pdfIn PDF document text
    • https://niwewuvikade.weebly.com/uploads/1/3/4/6/134629185/mitizixojufuwaweda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376610/normal_5fc45b4937ce4.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/c6f090b3-f46b-4457-8940-aeb1e19948c7/tijefenikotipape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50f41b5c-1151-4eac-9955-9f2dd841bb94/dokipo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48160f0c-9892-44ed-9732-dd1f1cf29c19/xudunesimamitodemixu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04a1c317-321b-4977-a1b2-88784838a569/olympic_bench_press_and_squat_rack.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/tamilrockers_kannada_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99d74d19-2526-4c7b-8a7a-fd1fd2e05956/melagisuwufulonojuwepijo.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_off0000d501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD501 5300 bytes
SHA-256: 78901a47a0fc313b49b45739155814b0b8ba1bc8e0c26caaa3ffa4d64eee19d3
font_01_sfnt_off0000e6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EE 10680 bytes
SHA-256: 445028698d05a0f2b2d94bc771e610ac31cf94433050a32ed70122b05d8368c7

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