Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc3a8d9dc6615979…

MALICIOUS

PDF

123.7 KB Created: 2021-01-15 06:44:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0627a4f53b3ebd641dee80153b80914b SHA-1: c65cf8adab82b5655fda381f7f0cc1f3a96de7ba SHA-256: bc3a8d9dc66159792978fa943fe946faa6a994e746cb687141c89ba887048a40
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also assigned a high probability of maliciousness. The embedded URLs suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ggtraff.ru/aws?utm_term=broadcom+tomahawk+2+datasheet In PDF document text
    • https://site-1182839.mozfiles.com/files/1182839/speedway_masters_2_demo_mod_apk.pdfIn PDF document text
    • https://site-1168081.mozfiles.com/files/1168081/wizz_airlines_phone_number.pdfIn PDF document text
    • https://ruxibini.weebly.com/uploads/1/3/2/6/132680870/rudukujukaperi.pdfIn PDF document text
    • https://site-1204352.mozfiles.com/files/1204352/vosalikezuzuritudoko.pdfIn PDF document text
    • https://site-1166084.mozfiles.com/files/1166084/tigabodupawa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386824/normal_5f9096564b4b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416149/normal_5f9b7413e87b8.pdfIn PDF document text
    • https://site-1173675.mozfiles.com/files/1173675/mechanical_energy_equation_with_friction.pdfIn PDF document text
    • https://tunimesepet.weebly.com/uploads/1/3/1/4/131455680/543c699a1ea.pdfIn PDF document text
    • https://fikijinifabuj.weebly.com/uploads/1/3/4/8/134899970/pobolab-pozegim.pdfIn PDF document text
    • https://pupazugosabi.weebly.com/uploads/1/3/4/8/134868946/zigufateruxa.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/xalexojaxipud/barcelona_vs_villarreal_5-_1.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/bijamugabujikafa.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_off000195ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195EC 3432 bytes
SHA-256: b1145803b4cd10866ae69c534c47b10b685e992e59c6cb1d05ea084f7722b85d
font_01_sfnt_off0001a23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A23B 5484 bytes
SHA-256: 8ae0b5e9893de5cd7e0ebc66775a3bcf274a134e318a9ce0358c7775e34337ff
font_02_sfnt_off0001b4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4D1 13204 bytes
SHA-256: 9d0f6b371850e90516a9284d529bea60674706a6881d294b8295d6d1315361b9

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