Malicious PDF — malware analysis report

Static analysis result for SHA-256 01f1a682a3ee2651…

MALICIOUS

PDF

82.4 KB Created: 2021-05-31 14:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4bcc8d2c1db7af672d87df77583de41 SHA-1: 20b3f37fb5124feb392e8808816521a67584a0b5 SHA-256: 01f1a682a3ee26511df8b2a51caf75d927d8a7735cc186dcd2960f97d63a2222
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly and other file-hosting services, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pelibifir.ru/strik?utm_term=ejercicios+diptongos+e+hiatos+1+eso+pdf+con+soluciones
    • https://motedozanegiraz.weebly.com/uploads/1/3/1/3/131383309/jurutijoduzuzesiv.pdf
    • https://lufojegixibebaz.weebly.com/uploads/1/3/1/4/131407324/1685336.pdf
    • https://static.s123-cdn-static.com/uploads/4427799/normal_5ff1c629a20aa.pdf
    • https://lojejibat.weebly.com/uploads/1/3/4/8/134861033/1655357.pdf
    • https://lapefobok.weebly.com/uploads/1/3/4/6/134663543/ruditatevisomafaxej.pdf
    • https://static.s123-cdn-static.com/uploads/4424040/normal_5ff366544fb64.pdf
    • https://cdn-cms.f-static.net/uploads/4464707/normal_60314158cc37b.pdf
    • https://sijodeteketede.weebly.com/uploads/1/3/4/4/134486162/1710225.pdf
    • https://xegubivagemegi.weebly.com/uploads/1/3/4/4/134481439/713279.pdf
    • https://cdn-cms.f-static.net/uploads/4460247/normal_5fd295db411da.pdf
    • https://static.s123-cdn-static.com/uploads/4371799/normal_5ff0a93eabfeb.pdf
    • https://cdn-cms.f-static.net/uploads/4502906/normal_605a66814acb4.pdf
    • https://cdn-cms.f-static.net/uploads/4483587/normal_602ec608f14e7.pdf
    • https://static.s123-cdn-static.com/uploads/4419205/normal_5ffcbf6beb35c.pdf
    • https://jiziweradufib.weebly.com/uploads/1/3/4/8/134847172/zejile.pdf
    • https://cdn-cms.f-static.net/uploads/4370286/normal_6014b347a9bcb.pdf
    • https://moxamegok.weebly.com/uploads/1/3/3/9/133999551/8235344.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fa35a667-3f5a-4a8b-b959-7557b010da43/54690579226.pdf
    • https://uploads.strikinglycdn.com/files/d9d43a8a-b0c3-4104-872a-c5809ae4ea57/satodelekifukuxolewajob.pdf
    • https://uploads.strikinglycdn.com/files/2ba5c0fa-a9e7-4255-ace9-03bace917fba/how_to_disassemble_a_nordictrack_elliptical_machine.pdf
    • https://uploads.strikinglycdn.com/files/492d47de-6027-45da-b852-4e351e544f38/introduction_to_documentary_bill_nichols_second_edition.pdf
    • https://uploads.strikinglycdn.com/files/26eebbe5-2742-4e08-9ae0-a6867ac95303/motorola_g6_plus_specification.pdf
    • https://uploads.strikinglycdn.com/files/d5db419a-fc71-423e-8b41-ff2026801df1/98079378964.pdf
    • https://uploads.strikinglycdn.com/files/3f12ce1e-656e-4e7f-a8ad-e7970b4c3480/safagakuto.pdf
    • https://uploads.strikinglycdn.com/files/8324198b-0e62-476f-8f97-6204113e2bad/best_truck_driving_school_in_nyc.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_off0000e977.bin
7eb5609c334ddede3fe5113f837e812bd6fa6f3bf1704a93e94689c5ec61d9df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE977 5504 bytes
font_01_sfnt_off0000fc37.bin
4faa90a40739adeea17e8b95f8e991c6b3c48adac6b0d90968c96fc12fbf7b48		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC37 12112 bytes
font_02_sfnt_off0001239e.bin
c9b9d40238817e9fd1c0b290bb100284b8f2d9dcc1188338581b9d27efa8fa30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1239E 16392 bytes

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