Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b9ea1b3d30627c…

MALICIOUS

PDF

79.2 KB Created: 2021-03-16 19:43:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cda55c1e549682c43f7606ad26ca6a9f SHA-1: 2009cb28566ca6402694231bcb5cdef62fb81538 SHA-256: 98b9ea1b3d30627c07f7b878309d5d49fdea94b5bf9accb79d8524c08ff42a09
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to disposable hosting services, indicating a link farm or SEO spam campaign. The presence of a URL with a 'utm_term' parameter suggests a potential phishing lure or attempt to drive traffic to a malicious site. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/strik?utm_term=is+500+mbps+fast+enough+for+netflix PDF link annotation
    • https://punekoba.weebly.com/uploads/1/3/4/6/134612552/336751.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445544/normal_60045fa68404c.pdfIn PDF document text
    • https://kadefevexenikoz.weebly.com/uploads/1/3/0/8/130813118/xikodurewekaluz_dosowakofegifoz_mujawinetaf.pdfIn PDF document text
    • https://muvuvudu.weebly.com/uploads/1/3/5/3/135351086/wibiweri.pdfIn PDF document text
    • https://sovurides.weebly.com/uploads/1/3/5/3/135349611/2661549.pdfIn PDF document text
    • https://xibixijuli.weebly.com/uploads/1/3/5/3/135399677/9840316.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452851/normal_601d965d0ba02.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365553/normal_600277d59c0ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472481/normal_60274c6e9004d.pdfIn PDF document text
    • https://gudimutukadido.weebly.com/uploads/1/3/4/6/134648046/wisikok.pdfIn PDF document text
    • https://pitiwiju.weebly.com/uploads/1/3/4/6/134687602/govore-datezejeva-rezoludagipido-bukox.pdfIn PDF document text
    • https://jubibesu.weebly.com/uploads/1/3/1/3/131379113/juzomimugit_mozilabudepafe_fudeweki_borewusumuve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483082/normal_601aeedd237ca.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
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_b435bfb4046246fe972a823f49d084e8.pdf?index=trueIn PDF document text
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_51cf7d13a5214d62af87c56627ca93f2.pdf?index=trueIn PDF document text
    • https://973697ad-ffa4-4f9d-85cd-0c9d1ea039ee.filesusr.com/ugd/5f5755_d87a68edce834a809bf5dfd38007609f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dd757d5-1160-42e8-9195-c1414490b0c6/diwobusirenej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ec4424c-7a67-42de-ae08-c1c4f471efef/wapuduw.pdfIn PDF document text
    • https://3d9856c9-ddaf-40ef-ab37-14107f3d3ee7.filesusr.com/ugd/938106_7e83f733e49748eb9e9392fec77be48d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9b8edab-9ba6-40cc-92dc-6b33803459d3/fortune_telling_using_playing_cards_free_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9a9a116-841c-48ba-95d0-b8017474d54c/povonupevemixa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94b51131-3bae-4cc8-8469-72ff3cca0d3b/52024598335.pdfIn PDF document text
    • https://ae8c1479-5121-4009-b0ed-8259dbb1205b.filesusr.com/ugd/0aff45_c40147be3b5f43729678750189ac5c80.pdf?index=trueIn 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_off0000e880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE880 5608 bytes
SHA-256: cc5599116be758b30b105c143609421dfe85ac8e8121ade795521c79e369dcb8
font_01_sfnt_off0000fb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5E 11028 bytes
SHA-256: 99211dc244e351c137aaf93784fca9fcfbe8c19b5c2db6d54e628d1ca043eb50
font_02_sfnt_off000120ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EC 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3