Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a4b57f052f48559…

MALICIOUS

PDF

64.1 KB Created: 2021-01-04 21:47:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: cdd06edef6384af4e266859a826db163 SHA-1: d0edba03121558bbd524d7ea46f78b8a331dfe00 SHA-256: 9a4b57f052f485590aa5ea4ab72920fab28617102bb1cd3a6b11c079bf6a6237
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many pointing to disposable domains and potentially malicious redirectors, as indicated by the PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics. The ML classifier and ClamAV also flagged this file as malicious, suggesting it is part of a phishing or malware distribution campaign. While no scripts were explicitly extracted, the nature of the links suggests a redirection to a malicious payload or phishing page.

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://ggtraff.ru/aws?utm_term=daru+badnaam+kardi+song++raagsong In PDF document text
    • https://cdn.sqhk.co/golomamone/awjbJjh/xadadekaforitusatimim.pdfIn PDF document text
    • https://cdn.sqhk.co/pujunuzivas/41YghZR/country_war_battleground_survival_shooting_games_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vefutifeves/jjMYoB3/dawogetoj.pdfIn PDF document text
    • https://cdn.sqhk.co/dodiniwotud/gigaNhb/macman_insurance_fairfield_ct.pdfIn PDF document text
    • https://furutivox.weebly.com/uploads/1/3/4/3/134360368/8461017.pdfIn PDF document text
    • https://wikazire.weebly.com/uploads/1/3/0/9/130968935/9631668.pdfIn PDF document text
    • https://piturerakilapes.weebly.com/uploads/1/3/0/7/130775197/4681724.pdfIn PDF document text
    • https://cdn.sqhk.co/kisereta/c4digJY/jibjab_videos_free_christmas.pdfIn PDF document text
    • https://wifamiwipefap.weebly.com/uploads/1/3/0/7/130738562/7435739.pdfIn PDF document text
    • https://wowavimisaken.weebly.com/uploads/1/3/0/8/130814021/xasabusulagapi-dodamas-nazofova-remezodup.pdfIn PDF document text
    • https://wofinomedek.weebly.com/uploads/1/3/4/1/134108675/de204259f88b2b.pdfIn PDF document text
    • https://kufidadifijerid.weebly.com/uploads/1/3/1/4/131407945/3ed0272.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443576/normal_5ff16c8702f75.pdfIn PDF document text
    • https://wumibatolazonik.weebly.com/uploads/1/3/1/4/131437616/903de9e00ea4f0.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/kovezodepugov/palawubavisezubopa.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_off0000b994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB994 5316 bytes
SHA-256: 24a7b65c2d5ac3c7f55284d20be5f4afe37ca5f05285cecd491d3de33148869c
font_01_sfnt_off0000cb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB95 11756 bytes
SHA-256: 0b6782d74b0afaf1ad2d8217e30886699241a8412426ce7152dd227c5d2b4fa9

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