Malicious PDF — malware analysis report

Static analysis result for SHA-256 661bda429a01466f…

MALICIOUS

PDF

153.7 KB Created: 2020-12-05 13:21:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 698fcd11e86308cc5bc796f2611d0e2d SHA-1: 33a5ed1abbd53aa46d7311cbc646c6990ea828c5 SHA-256: 661bda429a01466ffa43fda212cc3a7b7893023138c3950c87cb70273c6ba6c3
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf. The numerous embedded URLs point to disposable domains hosted on services like Weebly, indicating a link farm designed to obscure the ultimate destination and evade detection. The primary attack pattern involves redirecting users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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 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://ggtraff.ru/123?utm_term=vedas+in+english+pdf In PDF document text
    • https://zekuwatifakaxi.weebly.com/uploads/1/3/2/8/132815855/nagusifivugubop.pdfIn PDF document text
    • https://dusexitope.weebly.com/uploads/1/3/4/6/134646398/960b96b0e.pdfIn PDF document text
    • https://wefolukozik.weebly.com/uploads/1/3/1/4/131406413/reguz.pdfIn PDF document text
    • https://kupanonul.weebly.com/uploads/1/3/4/6/134682697/nujolabunef_sovevamuzuri_xuwaxesasiw_magosezogife.pdfIn PDF document text
    • https://xijukuto.weebly.com/uploads/1/3/4/3/134354051/poxas_rukenazogodoti_joket.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416653/normal_5faf0e2f7e242.pdfIn PDF document text
    • https://timelasabo.weebly.com/uploads/1/3/4/3/134345700/najelasidor_nofejitu_tagazadobo.pdfIn PDF document text
    • https://kupifibadobibe.weebly.com/uploads/1/3/4/5/134512214/3377885.pdfIn PDF document text
    • https://lafefozusut.weebly.com/uploads/1/3/4/5/134597047/6323115.pdfIn PDF document text
    • https://dogiwubof.weebly.com/uploads/1/3/4/4/134400908/027fd6cd80.pdfIn PDF document text
    • https://kixakusafi.weebly.com/uploads/1/3/4/8/134891224/29d838dfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461748/normal_5fa2019d89a31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485927/normal_5fa7945202bb1.pdfIn PDF document text
    • https://garowenin.weebly.com/uploads/1/3/4/6/134662298/7add5e.pdfIn PDF document text
    • https://xalesuben.weebly.com/uploads/1/3/4/3/134368019/e2d704c3d6d5c4b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/potevip/xifujexok.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/ordering_fractions_worksheet_year_5.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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F241 3564 bytes
SHA-256: 5aaa644fd5515ff802fb70a42304b53d97f17308fe2e77827936a35e79ffbc54
font_01_sfnt_off0001feb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FEB9 5172 bytes
SHA-256: 0dd2b96d59608d29f2586d9038c2daf5079aecfeb73bee3449b645eb0d60625b
font_02_sfnt_off0002104e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2104E 5832 bytes
SHA-256: e9fcb2c96e62ce1e9f09ef78613b13cd72c581c9c6563478ef939d05c00c6930
font_03_sfnt_off00021f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21F0E 15744 bytes
SHA-256: d8fca75d6d8390990f4986ec0880ae7a295b43172dff0895f8779ccd6f2ded95
font_04_sfnt_off00024dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24DD2 2700 bytes
SHA-256: b11cc0c9f53d69cc35b613b061618d7131dba8bbc1f9a7d9a06bb773d1678245