Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4c3375c106b6bf…

MALICIOUS

PDF

81.2 KB Created: 2021-05-31 00:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 2c7c19ecd5f8c472122d9138d27f812c SHA-1: 5511ad1752490c43677fa9b45bc3700d9282d13b SHA-256: ad4c3375c106b6bf3e6797fcce5ec5daa399b3473099fefbbc6d9489597460eb
244 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a link farm and a redirector to malicious infrastructure. The embedded links, such as 'https://yafferge.ru/123?utm_term=%25C3%25B6nermeler+ve+bile%25C5%259Fik+%25C3%25B6nermeler+konu+anlat%25C4%25B1m%25C4%25B1+pdf', are likely intended to lead users to phishing or scam content. No scripts were extracted, but the extensive link farm suggests an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=%25C3%25B6nermeler+ve+bile%25C5%259Fik+%25C3%25B6nermeler+konu+anlat%25C4%25B1m%25C4%25B1+pdf In PDF document text
    • https://bumopajuri.weebly.com/uploads/1/3/0/9/130969054/7843658.pdfIn PDF document text
    • https://wapefoko.weebly.com/uploads/1/3/5/3/135337073/lenalemanani.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468550/normal_5fe02fbbd8032.pdfIn PDF document text
    • https://tibagikusutugox.weebly.com/uploads/1/3/0/7/130775046/772e20f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423166/normal_60328af714d0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407085/normal_603ea11b71f24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464851/normal_5fd183bec8786.pdfIn PDF document text
    • https://donurufeto.weebly.com/uploads/1/3/4/8/134898164/vamopidedesekonume.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445750/normal_604472b954511.pdfIn PDF document text
    • https://kumemuwopix.weebly.com/uploads/1/3/4/7/134709330/5843241.pdfIn PDF document text
    • https://rurubimak.weebly.com/uploads/1/3/4/5/134594751/bozanes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366340/normal_5fce342eb0b79.pdfIn PDF document text
    • https://lijupumo.weebly.com/uploads/1/3/4/4/134496400/tezeburoborox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/15d77825-ed82-4065-bf5b-b2c95d5644fc/how_to_repair_epson_l110_printer_ink_pad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e9a55a6-6a1d-448e-a23c-1d3d685f96da/66091286214.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00fbe14c-9c01-4661-b1a6-7333d512f7ef/xaxodun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a039b07-f616-465c-b3d2-9843695af4a9/when_should_you_capitalize_an_asset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29da750b-465b-458c-b844-a240ee084675/cosmic_serpent_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54355a3f-9f6d-47af-b013-952266e6aa8a/vutotuzexuxesanimotinar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89a32339-dacb-4696-aa49-88a74f226747/34021821367.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE482 5748 bytes
SHA-256: 0353c6bdd7348d10404052a1fa2e844bbf968ebac5e5fce4e05130d733d010b4
font_01_sfnt_off0000f7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B7 12456 bytes
SHA-256: 2d5d535894c6f9371faf6812eee94a897b19a840adecc54a35b2154f44cfe42d
font_02_sfnt_off00011e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5A 16348 bytes
SHA-256: 4a27f1013122c6d3f2c58996e986cd2fa95c4a77339c81d34c8275456d7a2e9d