Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa9e0e4281cf9be2…

MALICIOUS

PDF

94.2 KB Created: 2021-06-04 20:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a84332feeae954b850c073be81b44bf1 SHA-1: 66a7f63fc14dbff211e9670a0c70d22df7680359 SHA-256: fa9e0e4281cf9be27fc623bba2d077dae435e323ad2b457f62cfbada575e7316
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, identified as a link farm, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a user manual, likely a lure to encourage clicks on the malicious links. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://archism.ru/pbw?utm_term=mode+d%2527emploi+chaudiere+chaffoteaux+et+maury+nectra+top PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421637/normal_601df98539ce4.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4464315/normal_60b6e04fc81e7.pdfIn PDF document text
    • https://powumebaporisav.weebly.com/uploads/1/3/4/8/134891471/rewupukekazo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392218/normal_5fc8c37dbc56e.pdfIn PDF document text
    • https://fakazurirogedim.weebly.com/uploads/1/3/4/7/134743668/xejukakirov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373778/normal_5fd21bd16142f.pdfIn PDF document text
    • https://jitavemalidev.weebly.com/uploads/1/3/1/8/131871699/3885417.pdfIn PDF document text
    • https://nekemobo.weebly.com/uploads/1/3/5/3/135323096/803926.pdfIn PDF document text
    • https://guxevelanitab.weebly.com/uploads/1/3/4/7/134769418/537597.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383449/normal_6034476960e62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469640/normal_603c511ce53c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415739/normal_604e8c7624daa.pdfIn PDF document text
    • https://jigupipugefelo.weebly.com/uploads/1/3/4/3/134387822/8412518.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368977/normal_60b7fc106cfc0.pdfIn PDF document text
    • https://xitenewoz.weebly.com/uploads/1/3/4/3/134314294/dosesikolej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469827/normal_601ec1d88e51b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445114/normal_6041f40296b64.pdfIn PDF document text
    • https://nakaleraba.weebly.com/uploads/1/3/4/6/134606700/594404.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451033/normal_60028cb930198.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/5f978b40-c073-485f-989a-c15c086c93ca/rebuzokelodalaze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/828fd198-6ca8-4add-a0bf-02f30f188857/best_aimpoint_pro_mount.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40b16219-8f45-434c-8820-5939f973069e/gre_test_dates_usf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52c3c154-35e0-4242-b1a8-d0c58a2c2a20/how_to_write_an_introduction_for_a_lab_report.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E13 5428 bytes
SHA-256: dc60db57a04c2de3d666071de99584f5aa3b869139409c6171c6665942b0ae82
font_01_sfnt_off0001407b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1407B 12744 bytes
SHA-256: 325d48a86ea8bfe6c376482ef9a19ece455fba73a9bb4440cd0df3339841bd98