Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ee22f0719883ac4…

MALICIOUS

PDF

98.3 KB Created: 2021-04-03 21:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24bc768a05289cde345bb81720a9097d SHA-1: d0f6ab421164116eba86f9b1d14cc8f2f33cb085 SHA-256: 2ee22f0719883ac4d76e5bccbe628985b24f7f8418d936a307fb2a8d380f65a8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic flagging it as a link farm designed to direct users to various external sites. One prominent URL, 'https://dafemum.ru/123?utm_term=china+visa+application+form+2019+malaysia', suggests a phishing lure related to visa applications. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/123?utm_term=china+visa+application+form+2019+malaysia
    • https://static.s123-cdn-static.com/uploads/4371020/normal_5fe2a1945d173.pdf
    • https://cdn-cms.f-static.net/uploads/4473902/normal_604dc41b80ba2.pdf
    • https://cdn-cms.f-static.net/uploads/4477629/normal_603b9ace7baf1.pdf
    • https://cdn-cms.f-static.net/uploads/4476443/normal_605054d30e6d4.pdf
    • https://doselarifiniwa.weebly.com/uploads/1/3/2/8/132814949/8961294.pdf
    • http://kinoogf.space/15190870017luui6.pdf
    • http://duzodukigesutif.iblogger.org/metodo_descriptivo_correlacional.pdf
    • https://cdn-cms.f-static.net/uploads/4384633/normal_603a3df71221e.pdf
    • https://static.s123-cdn-static.com/uploads/4404730/normal_600213f9980ed.pdf
    • http://tuimag.ru/dell_latitude_e6430_laptop_stuck_in_airplane_modeanmub.pdf
    • https://tusukufuduma.weebly.com/uploads/1/3/4/4/134458322/7687679.pdf
    • http://lestyprin.online/vesipefesesvoy9.pdf
    • https://guvikaki.weebly.com/uploads/1/3/4/5/134519546/775da6da13.pdf
    • https://betetudiju.weebly.com/uploads/1/3/5/3/135348010/depejojajez-fuzidosululeb-luduna.pdf
    • https://cdn-cms.f-static.net/uploads/4418788/normal_600e131303141.pdf
    • https://static.s123-cdn-static.com/uploads/4484115/normal_5ff96a2f4aff5.pdf
    • https://gepagalegizexu.weebly.com/uploads/1/3/4/4/134478943/2152430.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d16e604d-4916-4ba6-aeff-01777769a103/plantronics_voyager_legend_charging_case_instructions.pdf
    • http://wuvasof.epizy.com/hybrid_bike_fit_guide.pdf
    • https://uploads.strikinglycdn.com/files/3ab9fa27-a8a1-4022-9a27-84bcf2cecb65/bill_nye_phases_of_matter_worksheet_answers.pdf
    • http://fatifosavo.rf.gd/autobiography_of_sachin_tendulkar_free_download.pdf
    • https://uploads.strikinglycdn.com/files/0e2d1de0-099c-47ab-be95-65be8f0cb754/truyn_kiu_ch_nm.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012538.bin
ab88659c7940002318ffcfc0c1f0717c2cc57daf5999c85afe9ec7e9145f5b0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12538 5804 bytes
font_01_sfnt_off000138de.bin
b72d65bb8ef145bbe92fd5805c1989d5322e439459c2c0ccc459a4c3be3dec25
pdf-font-stream PDF embedded font (sfnt) at offset 0x138DE 12496 bytes
font_02_sfnt_off0001628f.bin
58487ff9322d2e0d347e6b8a327f9aca56405a4d2f08567912d7b51da4f64369
pdf-font-stream PDF embedded font (sfnt) at offset 0x1628F 16772 bytes