Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a3f4940dbc05097…

MALICIOUS

PDF

85.9 KB Created: 2021-03-23 19:47:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3d220d244c4e5e90b4d8dd96069441b0 SHA-1: 3de2c3d11f40f7837b5e68e406ebd9d0b7a1f739 SHA-256: 2a3f4940dbc0509735c51f6465e59ec52a448d0b382ba8ac4132bb334f551d7d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. ClamAV and ML classifiers identified the file as malicious, specifically a phishing trojan. While no scripts were directly extracted, the presence of numerous external URIs indicates a likely attempt to lure users to compromised or malicious web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=unit+7+level+d+vocab+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416496/normal_601a0e1a30d90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383568/normal_6018db29bd959.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379856/normal_601ccd6785ad7.pdfIn PDF document text
    • https://lenoloxib.weebly.com/uploads/1/3/4/0/134040664/satenenisaw_kifepumi_xijesamebesopos_lejufi.pdfIn PDF document text
    • https://bavejojonosepes.weebly.com/uploads/1/3/1/3/131380601/87fd29e8a912.pdfIn PDF document text
    • http://sosefuxewaduta.iblogger.org/59778860586.pdfIn PDF document text
    • http://debopuforu.22web.org/33719129063.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459805/normal_5fc940eba14c3.pdfIn PDF document text
    • http://tewepeserero.22web.org/jodasojefotavegusesawa.pdfIn PDF document text
    • https://dasufurejer.weebly.com/uploads/1/3/0/9/130969026/xekezimurotirumaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446915/normal_602b7534e04fd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://putazosaw.epizy.com/applebee_s_menu_to_go.pdfIn PDF document text
    • https://48e4e0df-78ce-4736-8797-27735e68dc67.filesusr.com/ugd/f3b179_33cf29cdc01949589194a44d0516b76a.pdf?index=trueIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_8e2b1f62369d4974ace46ed4300a16fb.pdf?index=trueIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_e9aaffe450614b9d8c74e08c52997c07.pdf?index=trueIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_4bc462dcee8249c8a8b785838c50e123.pdf?index=trueIn PDF document text
    • https://9005a25f-7293-4a73-bb0f-bc58e8c16807.filesusr.com/ugd/e3834b_494e3d27087046a28c30d6f0c324b6ca.pdf?index=trueIn PDF document text
    • http://tinatuvarisofat.epizy.com/buxaru.pdfIn PDF document text
    • https://e72deea9-3c4d-48de-8429-d2e8e2d5d9b3.filesusr.com/ugd/68b2df_bab9a80bf6574a74a03e27c9e4f33d5e.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10605 5296 bytes
SHA-256: f99b117e2160e7586d0b4f67441ee5bfd276e73fd3623c5bd5be8debe1943aad
font_01_sfnt_off00011830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11830 18248 bytes
SHA-256: 6c3a02067a8820b2bcd8e6ff08dcc7b0246246d9178c2f4f61d8cc9e6ef7596d

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