Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b252da9fd05f38…

MALICIOUS

PDF

75.5 KB Created: 2021-04-05 00:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b3f1829d96c3e94313e118f7c09105e4 SHA-1: 5cae318c5c14cad0f14272949b433b27b51995df SHA-256: f6b252da9fd05f382a6aede158ffd68a6c23258a623f3c166fe4792401b6f53c
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content or phishing sites. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/award?keyword=fool+me+once+piano+sheet+music+pdf PDF link annotation
    • http://shopyou.online/open_puzzle_box2p38b.pdfIn PDF document text
    • http://idealslimitalia-oficial.site/30290330690iqx7x.pdfIn PDF document text
    • https://sifirugosiwoxam.weebly.com/uploads/1/3/1/3/131384024/fexadirutunumeduku.pdfIn PDF document text
    • http://gloslides.com/71842235500wytu3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426966/normal_603966a77f3fe.pdfIn PDF document text
    • http://molotkov.site/glencoe_algebra_1_booke553w.pdfIn PDF document text
    • https://nebemono.weebly.com/uploads/1/3/4/3/134331812/430436.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4531626/normal_602886f7d6c26.pdfIn PDF document text
    • https://fomemifeju.weebly.com/uploads/1/3/4/7/134769467/917d94.pdfIn PDF document text
    • https://lerofiputa.weebly.com/uploads/1/3/4/3/134367001/vuzukan-napeveko-zotapujizan-bafibalurulig.pdfIn PDF document text
    • http://torchland.xyz/39554219575r91p9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_74e94ea8a38e43b09fc08614f837699a.pdf?index=trueIn PDF document text
    • https://d1ced4a1-fa29-4c66-b583-77209f32159a.filesusr.com/ugd/c88d8b_daeaf5e0f8844cc3913d92f719e3edbc.pdf?index=trueIn PDF document text
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_1246b402a78e4cf8be967a734b98d4b1.pdf?index=trueIn PDF document text
    • http://vivizegijarugip.epizy.com/power_episode_guide_and_air_dates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e16d1d95-cddd-4cfa-a989-6401b4e0e06a/international_finance_corporation_washington_dc_address.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfa891af-99d6-4e24-bdf7-b31df32dd89d/14561223961.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/747dcdfe-7736-4c66-aa65-123a0cf57273/best_dryer_repair_service_near_me.pdfIn PDF document text
    • https://be56f97b-0727-4a8e-a141-4155b83e75ac.filesusr.com/ugd/5034d0_77fed02fd04a41a4b2dcb56401ba4823.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f690d59e-2d45-4c07-978d-99a679e8ec19/62866274226.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/247cbe27-3f0b-4226-8b53-20910bebda86/5_second_journal.pdfIn PDF document text
    • https://b46c4cda-4951-41c0-816f-bbf02eee4d9b.filesusr.com/ugd/4ff992_40a3d6157afc4928a2e63e672895f00d.pdf?index=trueIn PDF document text
    • http://gusalixofunek.epizy.com/78092816544.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_off0000e9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B6 5252 bytes
SHA-256: a598de1b343e0ad68ddb267d79acc7005bba7370c5d2520ef07701cf5f942768
font_01_sfnt_off0000fb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB71 10748 bytes
SHA-256: d13fe434043d7a84418fba9ff34f7013877bb35ea87f9cd4d060f7355b6dc47b