Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f5739a228e0ebb5…

MALICIOUS

PDF

88.6 KB Created: 2021-04-05 03:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c65f315d069071242f4ec77a547097e6 SHA-1: 9e8dfb08200f4fe75c665246ab8e0129af94efd2 SHA-256: 6f5739a228e0ebb5a824a9cbb0b772038e7ef9dcdab1530bcc517bfcc4c750b1
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. The presence of a 'download button' lure further supports this. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://botokaw.ru/award?keyword=curly+girl+method+book+pdf+download PDF link annotation
    • https://vezutokabev.weebly.com/uploads/1/3/4/7/134758566/8045194.pdfIn PDF document text
    • http://azorocheat6.xyz/94750816307ahxgp.pdfIn PDF document text
    • https://cdn.sqhk.co/losomilodip/aPrifaV/gibizawumiw.pdfIn PDF document text
    • https://wonaxegem.weebly.com/uploads/1/3/6/0/136049801/ec8953441b8bcdf.pdfIn PDF document text
    • https://vekerarefatada.weebly.com/uploads/1/3/4/8/134868636/8668613.pdfIn PDF document text
    • https://cdn.sqhk.co/jizuxadif/l6RBiif/9455149257.pdfIn PDF document text
    • https://ruginimurixibiz.weebly.com/uploads/1/3/1/6/131606491/wipukolimovexo.pdfIn PDF document text
    • https://cdn.sqhk.co/bogovureg/5icttji/35878072731.pdfIn PDF document text
    • http://hr-insider.com/the_crucible_act_2_countless_conflicts_answersspqj8.pdfIn PDF document text
    • https://nemabofafuz.weebly.com/uploads/1/3/5/3/135389169/tilidopojabevef_natagat_wubimugururuw_dejojusimu.pdfIn PDF document text
    • http://anarchymedya.com/ferejigeiyqko.pdfIn PDF document text
    • https://basavorulifa.weebly.com/uploads/1/3/4/8/134899730/a16394.pdfIn PDF document text
    • http://jirafka.space/25931795528pf8cn.pdfIn PDF document text
    • https://toxofeleziwogiz.weebly.com/uploads/1/3/1/4/131406173/5886fade352c.pdfIn PDF document text
    • https://mirezavofuju.weebly.com/uploads/1/3/4/8/134870541/3615328.pdfIn PDF document text
    • https://cdn.sqhk.co/fivukidado/iciYogj/17544836397.pdfIn PDF document text
    • https://laguvibokabab.weebly.com/uploads/1/3/4/3/134383318/meniladopebuparixeno.pdfIn PDF document text
    • https://lexezidelaxo.weebly.com/uploads/1/3/4/6/134605078/nosonobavota.pdfIn PDF document text
    • http://onlinetiser.website/onan_microquiet_4000_fault_code_32cg4j5.pdfIn PDF document text
    • https://cdn.sqhk.co/jumivosokigo/xidhfie/89901915380.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_d6ec68fed32d41048b970ddb2b7cc93b.pdf?index=trueIn PDF document text
    • https://28a90398-13b1-4b58-b54c-ed045a6bddf2.filesusr.com/ugd/7e9e1f_4114195c24c44cf6befb5192fa154ee7.pdf?index=trueIn PDF document text
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_1c80746b8a6e4b67bea7f7dd8fca289d.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_off00011958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11958 5580 bytes
SHA-256: db7a092f2460185d1c096d9bc2809c8b9339ad30d5dc8ea25d58172dba9f72d7
font_01_sfnt_off00012c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C38 12180 bytes
SHA-256: 5bd57241b74bb36252e161d3cfa49dff8c7809d3f15be5d720b2d53c8d420ea1