Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b22db951a9aa69…

MALICIOUS

PDF

78.0 KB Created: 2021-02-04 13:47:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7b0ba1de5e3581c9b532ccca72a23e4b SHA-1: 4592810d1a2cd29931903bf5ac1c3f153eafdb63 SHA-256: 72b22db951a9aa6910beede6c88d40e9f857ade6524dbba8a43d0597c05f65ca
264 Risk Score

Malware Insights

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

This PDF file is identified as malicious due to its function as a link farm, directing users to multiple external URLs, some of which are known malicious redirectors. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the heuristics indicate a significant number of embedded links designed to manipulate search engine results or lead to phishing sites. The presence of a callback lure heuristic suggests a potential for social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/aws?utm_term=best+anime+wallpaper+hd In PDF document text
    • http://servisvds.ru/restaurants_near_cross_roads_txslbv0.pdfIn PDF document text
    • http://mavpa.fun/974701867553xdj2.pdfIn PDF document text
    • https://zamamuxito.weebly.com/uploads/1/3/4/2/134234866/faluralu-denedavalip-nedasirozuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481065/normal_60192ca8c85c8.pdfIn PDF document text
    • https://nugazemagutum.weebly.com/uploads/1/3/4/3/134346004/a7afde87d139e.pdfIn PDF document text
    • http://xplaintome.ru/73265023241oy03.pdfIn PDF document text
    • http://pristav.pro/60792839338ve4ih.pdfIn PDF document text
    • http://smeshnoykir.space/getonodj1lpt.pdfIn PDF document text
    • http://br1.red/fiwizelafuwaxovofarmqy8d.pdfIn PDF document text
    • https://felogenapugiro.weebly.com/uploads/1/3/5/3/135327705/gatiz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470828/normal_6000324fadb2b.pdfIn PDF document text
    • https://sojabejob.weebly.com/uploads/1/3/4/8/134890412/pasuvofax_vuxowipusagebi.pdfIn PDF document text
    • https://ruweveti.weebly.com/uploads/1/3/1/3/131379789/xagutixebife-mukezupozox-jikenupow-palisedom.pdfIn PDF document text
    • https://ribigitapupag.weebly.com/uploads/1/3/4/8/134887221/logilimumete_pifadotonibuni.pdfIn PDF document text
    • https://zujuwedidikaf.weebly.com/uploads/1/3/4/3/134375258/guzerorugukibam.pdfIn PDF document text
    • https://zofudugopevemob.weebly.com/uploads/1/3/1/6/131607066/xabegiga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498994/normal_5fcbcfa7bb51a.pdfIn PDF document text
    • http://oneplusonemain.xyz/sesulixaxenami4j41z.pdfIn PDF document text
    • https://polabobaxadujo.weebly.com/uploads/1/3/4/7/134775235/zodobi_jegone_foxot.pdfIn PDF document text
    • http://help-lnstagramcopyrights-verify.com/4219434090mfqiu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bejokazemur/classic_shell_start_button_skin.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/breakthrough_plus_1.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/wadedibuzopituzoko.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/pimobitiw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D8 5020 bytes
SHA-256: 8384d1b3c657843726138cbb9e310dabd388c1a6d8a5fbd40cd02ecc62435195
font_01_sfnt_off0000f7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BA 10972 bytes
SHA-256: 9183ed567aa59187dba029baef43bf80698da2db2102ddb4a0c153591dbed1fe
font_02_sfnt_off00011cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC8 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f