Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad64167ea6c2ddd…

MALICIOUS

PDF

80.4 KB Created: 2021-03-18 16:59:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6165f101b3564c62cc1ec92f0c9fedeb SHA-1: 301312d07b3703c9367d456b151b1939f7f6b77d SHA-256: 4ad64167ea6c2dddb5e6ef942bd71fe0fa9868858d4f294fdb9b5dba37bb2a82
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this file as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the presence of numerous external URLs suggests a redirection mechanism to potentially malicious sites, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://fokemale.ru/award?keyword=bossa+nova+guitar+rhythm+pdf PDF link annotation
    • http://dororuminaxa.mywebcommunity.org/naming_and_classifying_angles_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/bDhhadU/vimolubufisuvijite.pdfIn PDF document text
    • http://jarewitof.mypressonline.com/23852484706.pdfIn PDF document text
    • http://veselutut.mywebcommunity.org/que_establece_la_ley_de_ohm.pdfIn PDF document text
    • https://sirakogosi.weebly.com/uploads/1/3/4/6/134600403/vitezifefogolub_lefefimobeduga_vuduja.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/fNbgiHZ/boxing_vs_mma_fighter_mod_apk.pdfIn PDF document text
    • https://tuzutetenufiro.weebly.com/uploads/1/3/4/7/134716615/282366b4fe94.pdfIn PDF document text
    • https://cdn.sqhk.co/definuseju/khjibhi/resofajidoruzuwagezog.pdfIn PDF document text
    • https://tedajurilazunu.weebly.com/uploads/1/3/0/7/130739962/7f8b71997b23b.pdfIn PDF document text
    • http://nenegifivujaxu.mypressonline.com/41210331452.pdfIn PDF document text
    • http://zijaditenup.getenjoyment.net/fatobakaf.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/245b8491-8989-4317-a6eb-3a0b3e303e79/mini_displayport_dp_to_hdmi_vga_dvi_converter.pdfIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/wigapamu.pdfIn PDF document text
    • https://c2267750-1f6d-4c2f-944a-eb302c7f07d7.filesusr.com/ugd/93971e_97bdf508a3794c528ae15a4fec65bcdf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d3e2993-6df7-442d-ac2a-b086ddb12de3/4278181089.pdfIn PDF document text
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_8516070f7476477ea5b6e5169e5c7c2a.pdf?index=trueIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_8ce9ebad34764f8d8c112c21c079eaf2.pdf?index=trueIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_9238a9db1d634db986c273677fe3aec0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/55dffdb3-d608-443d-821a-1fbe7d3e03e6/tedidofikap.pdfIn PDF document text
    • http://nazowovemozugiv.myartsonline.com/gofusoxevepumubeg.pdfIn PDF document text
    • https://71f68c9c-1037-483c-a0ca-f268b7ddd3c8.filesusr.com/ugd/87fdc7_0f8cf045cccf409caf41b7e36e448832.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8E 5632 bytes
SHA-256: a7acde7d1a7717b7da50ed649f4a34fe341eb8c25d260ade476375567f67759a
font_01_sfnt_off00010195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10195 3020 bytes
SHA-256: 4fd8e84eed6b1f46b71c08ca94f3bd999c71f4bb10ba56db7403e286ee3ac98d
font_02_sfnt_off00010dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD0 10716 bytes
SHA-256: de01975c4cfaa0729690e375cdf4b95f393fac5c41f916fe0f0f06838540b3ad