Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ee56fa222a249b2…

MALICIOUS

PDF

70.0 KB Created: 2020-11-28 11:19:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e26055ec0bc0f1b60790cbff63de90ac SHA-1: 694bddfdf89f292ccda11137c00aef0f540fc68f SHA-256: 9ee56fa222a249b28c7fd4a6f54c5ea5ae121ecb2b85018cb369d233419df9ba
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to various websites, many of which are hosted on disposable domains or known redirectors. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://ggtraff.ru/strik?utm_term=demonic+gorilla+osrs+plugin In PDF document text
    • https://lusasapefo.weebly.com/uploads/1/3/4/2/134234623/1366209.pdfIn PDF document text
    • https://tokafiwunan.weebly.com/uploads/1/3/4/3/134372509/zumepovexowomi_kosawa_kuwelama.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391620/normal_5fad5e80eaea6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447270/normal_5fb387780f784.pdfIn PDF document text
    • https://pejopazuzaguwoz.weebly.com/uploads/1/3/2/8/132815183/5204409.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480423/normal_5fb2bf901f62e.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/lufalosuwamunuwonofe.pdfIn PDF document text
    • https://ravidaxixow.weebly.com/uploads/1/3/4/3/134315840/1830972.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sazixipame/ashampoo_free_vs_pro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ec3ff90-16ed-443a-a8f4-c8094a6da7b0/35124669574.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/accounting_solutions_manual_website.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0709bdfc-d37d-4481-ab45-500206a607dc/unix_concept_and_application_by_sumitabha_das.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_off0000d5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DD 5252 bytes
SHA-256: 1bc3cfab44e7c179edcce6a6e78363584490b2e5d20a5c172bf8d765c4fc8ff3
font_01_sfnt_off0000e7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AC 10040 bytes
SHA-256: 0d6c8b6d39f8ee2b1ebbbbd8a3254db2771a2b70769166ff1bf8928ca350fac7

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