Malicious PDF — malware analysis report

Static analysis result for SHA-256 563ac8f10c76f989…

MALICIOUS

PDF

83.3 KB Created: 2021-03-25 14:57:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 0d4a805e79ec726a63aff108dbff1271 SHA-1: de3a6129cfc85499f3e5e007bc3b90cc21201a54 SHA-256: 563ac8f10c76f989cdc58260ac858ccd2d6ccedbec1303ecd228150fb6315ac3
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, and includes a UTM term in one URL, indicating a potential phishing or SEO link farm strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=nordictrack+2450+vs+x11i PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4452382/normal_5fe5340476386.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503524/normal_60053f4363783.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499972/normal_5fdbe6764b248.pdfIn PDF document text
    • http://berozava.iblogger.org/angular_formcontrol_enable.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419820/normal_6003e2bfc2766.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pozijirume.rf.gd/hernia_guidelines_management.pdfIn PDF document text
    • https://65de77fc-0341-4fd2-89b2-cd6b005a91de.filesusr.com/ugd/cf79db_073f4eb6a4ad4f22b686cea947a95917.pdf?index=trueIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_c01cfc8ccd1d45beaae123ae975dcc14.pdf?index=trueIn PDF document text
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_ec1a24d85e094e77ad578a7007c90693.pdf?index=trueIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_08bc4b83ec1244358a8311dcce00e8b3.pdf?index=trueIn PDF document text
    • https://0f926834-650c-4d5a-b53c-ad60ae412ccc.filesusr.com/ugd/6a44d8_3727dafa554d409fb2edd3fee282dcd4.pdf?index=trueIn PDF document text
    • https://8a833fea-7c9a-4d2e-a5a7-d3590f42a3e5.filesusr.com/ugd/9aab09_aa2f61a9024742c6a9c0f358f1eadb40.pdf?index=trueIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_c5467a59e2944c068a4a7a6fbf382e17.pdf?index=trueIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_41d416e84bc1448fa28ef82e7b4f2e2a.pdf?index=trueIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_4886c2ed342c43a397a8ed6e956fbd02.pdf?index=trueIn PDF document text
    • https://a134ef9b-a212-4d8e-a35f-da3d896bbd40.filesusr.com/ugd/dadc92_5affeefbf8a04c81bdefa1eae6e0d2b6.pdf?index=trueIn PDF document text
    • https://fb075467-9d00-46c6-93ac-2b777f5e584b.filesusr.com/ugd/8bcd66_ea5973cb923448c3b86b93d267dd5cd2.pdf?index=trueIn PDF document text
    • http://misovin.epizy.com/77804857949.pdfIn PDF document text
    • http://sidimusi.rf.gd/monster_vape_labs_liquid.pdfIn PDF document text
    • http://surobufalinaxis.epizy.com/barbie_dreamhouse_game_apk.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_off00010658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10658 5600 bytes
SHA-256: 82ffaded091e19b5f9c016117d448811ba339d04cf523886e870654e16c936f1
font_01_sfnt_off00011998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11998 11396 bytes
SHA-256: ef3671e51de7b6df6ec75a7d4efcc8900d87e82dba0d87a60a29d41c1babdf19