Malicious PDF — malware analysis report

Static analysis result for SHA-256 af1d490cbd9a9d9f…

MALICIOUS

PDF

84.8 KB Created: 2021-01-13 10:03:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ebfab354060f4eb53cd0ba37eab203fc SHA-1: 5ab8bb84dd67a5766777637b4e66aa1d75931f9a SHA-256: af1d490cbd9a9d9f913461be2afecadad6c90d81aebaee2741e8e1682f12525f
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/wb?keyword=instagram%20logo%20font%20name PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481286/normal_5fb744daf05b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368972/normal_5f8f597a7227c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502721/normal_5fc9a8c65945e.pdfIn PDF document text
    • https://site-1175635.mozfiles.com/files/1175635/74788247764.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375698/normal_5f96dd2f4e49c.pdfIn PDF document text
    • https://nulixedupalaz.weebly.com/uploads/1/3/0/7/130739510/pijukawadotegulereda.pdfIn PDF document text
    • https://site-1179882.mozfiles.com/files/1179882/gudatetalatapuzotobera.pdfIn PDF document text
    • https://wusiparopebabo.weebly.com/uploads/1/3/4/5/134505529/375906.pdfIn PDF document text
    • https://site-1203466.mozfiles.com/files/1203466/microsoft_3d_pinball_space_cadet_play_online.pdfIn PDF document text
    • https://site-1173223.mozfiles.com/files/1173223/36980348405.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468531/normal_5fb870c41e6da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496602/normal_5feb97730c290.pdfIn PDF document text
    • https://site-1176333.mozfiles.com/files/1176333/listado_de_alimentos_con_hierro.pdfIn PDF document text
    • https://site-1176492.mozfiles.com/files/1176492/59856925314.pdfIn PDF document text
    • https://site-1176572.mozfiles.com/files/1176572/wuwewivexelofijofavewip.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://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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89F 4764 bytes
SHA-256: 45f91bf7ee79543b7233091bf1e1e35841d69e9da5d957b049ee3969c1dcb493
font_01_sfnt_off0000f8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A7 11740 bytes
SHA-256: dd1d9d4efd478ab8055578bb64af2e8093dd2f78b70759eb6b95493bcf0b50e5
font_02_sfnt_off00012096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12096 16624 bytes
SHA-256: 236ac184a8dda694d040e7921e2d394cd93b344b7385c9a654915062ad5352e1
font_03_sfnt_off000137ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CA 4324 bytes
SHA-256: ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c

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