Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff92be2ca1d653be…

MALICIOUS

PDF

87.1 KB Created: 2021-06-08 14:40:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8a23200e09b2d700d6568df8d4923dd2 SHA-1: 0a5a031af03cffa5a8e10eb3006330a6021e24fa SHA-256: ff92be2ca1d653be84321ec815b0ea974767579ae35046276f58bfeb8ecfa126
206 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 hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of external URIs and the link farm structure points towards a tactic to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://xajibur.ru/123?utm_term=messenger+story+saver+apk PDF link annotation
    • https://jazasamiwuri.weebly.com/uploads/1/3/4/8/134889091/5062594.pdfIn PDF document text
    • https://xuxuratedagofat.weebly.com/uploads/1/3/4/6/134644764/5809946.pdfIn PDF document text
    • https://pejedakava.weebly.com/uploads/1/3/1/4/131453393/vovosuvewokugaje.pdfIn PDF document text
    • https://wanomumopanud.weebly.com/uploads/1/3/1/3/131379193/mesojodotigam_gutiwasos_kusetirov_josepikeg.pdfIn PDF document text
    • https://rovetizewi.weebly.com/uploads/1/3/0/7/130776299/dilogode_dosun_nagelizis_duzuxavek.pdfIn PDF document text
    • https://zalatedaduliwa.weebly.com/uploads/1/3/4/8/134881590/fumaminixeravuniw.pdfIn PDF document text
    • https://befofevaz.weebly.com/uploads/1/3/0/9/130969220/62862ab86b6a82b.pdfIn PDF document text
    • https://popilezofale.weebly.com/uploads/1/3/1/1/131164236/251769.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/74cf6a3f-483f-4bdd-a1bd-af9e2e428ed4/richard_bandler_books.pdfIn PDF document text
    • http://zizovitunex.pbworks.com/w/file/fetch/144644472/davibixesukoxaxojez.pdfIn PDF document text
    • http://niwomif.pbworks.com/w/file/fetch/144563691/how_to_check_kwsp_statement.pdfIn PDF document text
    • http://xizisimavi.pbworks.com/w/file/fetch/144667665/96926283850.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9238cdbc-3b04-4d37-8027-123c54a966fe/state_employees_credit_union_near_me_directions.pdfIn PDF document text
    • http://razodegotit.pbworks.com/w/file/fetch/144870798/how_do_you_treat_shoulder_impingement_syndrome.pdfIn PDF document text
    • http://jetipufagi.pbworks.com/w/file/fetch/144442038/59868734306.pdfIn PDF document text
    • http://mapaduzipi.pbworks.com/w/file/fetch/144526695/dabifolijevaberi.pdfIn PDF document text
    • http://xedidovetaw.pbworks.com/w/file/fetch/144414486/brentuximab_vedotin_uses.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_off0000ffa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA8 5188 bytes
SHA-256: e055a1ea5cf287e001fa05f5ea1c1419256b725afe5fc73cf820f823e79b1d87
font_01_sfnt_off0001117e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117E 12388 bytes
SHA-256: 4a9450aa78b5940decc510a31d5c6def6bbab2b2dc06949c636a4373be55510b
font_02_sfnt_off00013a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6D 16132 bytes
SHA-256: 4f6d6443d667672870c38ce4e1d364e29e61a0df6fd2d8217a47270b9fff04c9