Malicious PDF — malware analysis report

Static analysis result for SHA-256 495ab4b5d2edb2d1…

MALICIOUS

PDF

67.4 KB Created: 2020-11-12 14:54:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 60f0e613694281ec2e6d4953c92136d7 SHA-1: d649dab181ebbddc00b4d5a8e730412a8025b21b SHA-256: 495ab4b5d2edb2d16d8e67ff4c0cf64d8f285a400cd84f78986a3c3e37fabfb2
244 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm on disposable hosting. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of numerous external links, including one pointing to known malicious infrastructure, suggests this PDF is part of a phishing or spam campaign designed to redirect users to malicious sites.

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://traffking.ru/123?utm_term=the+howling+man In PDF document text
    • https://kavaxaxogemiren.weebly.com/uploads/1/3/4/4/134441995/lojubojawuwulu_davinapewu_morimabifi_zisobolaxi.pdfIn PDF document text
    • https://tanaxigurav.weebly.com/uploads/1/3/4/2/134266775/5476235.pdfIn PDF document text
    • https://robonodibogiva.weebly.com/uploads/1/3/4/6/134630072/88258e64bc06.pdfIn PDF document text
    • https://rozolabo.weebly.com/uploads/1/3/0/8/130814594/2475038.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371240/normal_5f8c621cadc03.pdfIn PDF document text
    • https://ponixojezunuto.weebly.com/uploads/1/3/0/9/130969897/lepedemodujoz-bunavuvuneno-zojefivudu-vibegeluxo.pdfIn PDF document text
    • https://bonujuvab.weebly.com/uploads/1/3/2/7/132740321/834649.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/2698cd81-0334-4be0-b79c-7460244d071f/7533469142.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d48c8ed-417c-4dff-9f3b-7f6d58d1acc6/65374807590.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc874758-ed1b-44bc-8e9f-3a2a3522e6f4/vuxatikixamosaxivuvu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b705213a-1215-4979-8b19-2306cd6e00e0/80201970876.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_off0000ccff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFF 4868 bytes
SHA-256: 63d5857a31f8e83b0f2bd241b656a676a287de550259e33cac344b2d9c1467fc
font_01_sfnt_off0000dd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7B 10576 bytes
SHA-256: 5bed853d97bc79fd1e1a6cc16f0c9960c44a644f553edd97939b6a8cf094a653

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