Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d0445f55d814ad…

MALICIOUS

PDF

86.6 KB Created: 2021-02-28 21:22:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 01bb0c3b9d6c87128ec2186175df3cdb SHA-1: 9f795e7cd408f003d8c5ad0562a6163e088f6da2 SHA-256: 51d0445f55d814ad4c60c6592a1d062003fa028fff04d6038ed074060d702ba6
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains embedded links, with at least one pointing to known malicious redirector infrastructure. The document's purpose appears to be phishing, attempting to trick users into visiting a malicious URL by disguising it as a search result for 'Air hogs rc helix x4'. No scripts were extracted, but the presence of malicious links is sufficient evidence of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://yafferge.ru/123?utm_term=air+hogs+rc+helix+x4 In PDF document text
    • https://cdn.sqhk.co/wuxaguzifep/ZhbFjc1/firefighter_costume_mens.pdfIn PDF document text
    • https://lidutefavova.weebly.com/uploads/1/3/4/0/134012516/situmurigagizotov.pdfIn PDF document text
    • http://alphabitx.com/matudibowematodaxurewe594ck.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379236/normal_60369d5ef1e1a.pdfIn PDF document text
    • http://dumubemajizukov.medianewsonline.com/3291717736.pdfIn PDF document text
    • https://gakujoxabusu.weebly.com/uploads/1/3/5/3/135394689/moridavobofeke_wuvut_petolubebokax.pdfIn PDF document text
    • http://cartest.pro/wondershare_filmora_tutorial95dd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465703/normal_5fd202e16ff63.pdfIn PDF document text
    • https://lumovomudin.weebly.com/uploads/1/3/4/7/134704265/210338.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/gdgf0jv/badefoxigugagitaro.pdfIn PDF document text
    • http://shoop-fr.ru/wixopitenopibaloxiw3i1o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://rorazizaxaf.atwebpages.com/66953568535.pdfIn PDF document text
    • http://bamisuk.rf.gd/joint_cumulative_distribution_function.pdfIn PDF document text
    • http://wizigipixe.atwebpages.com/kuguvug.pdfIn PDF document text
    • http://bekusisit.atwebpages.com/10974658855.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AC 4600 bytes
SHA-256: fbfb17f42b187542e58c0c51f64acde5126efb420025bbb5d67a86cf97d9d76f
font_01_sfnt_off0001195e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195E 11112 bytes
SHA-256: 3bb609c80dc9b41e41fd5f2d8e1ebace7e2cb558b5dbdac4f087cf07098f7fd9
font_02_sfnt_off00013f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F23 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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