Malicious PDF — malware analysis report

Static analysis result for SHA-256 afccdcd09d63093b…

MALICIOUS

PDF

71.6 KB Created: 2021-02-11 19:18:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 9bb7eff44c1f5620191d934768771f9c SHA-1: 485db36ea62e97ba65ac830a984b8443fc0655d3 SHA-256: afccdcd09d63093b9d8583a2017f8b43287fea1e6e9df149cca69cdd097ea32d
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous embedded links, many of which point to link farms designed to manipulate search engine results. The primary redirector URL, 'https://yafferge.ru/wix?keyword=java+to+apk+converter+free+download', suggests a lure related to software downloads. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded links and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=java+to+apk+converter+free+download In PDF document text
    • https://mejonozawus.weebly.com/uploads/1/3/4/0/134016798/kozarogi-jabigeje-munatitesukezi.pdfIn PDF document text
    • https://sesifubonimexa.weebly.com/uploads/1/3/5/3/135317238/2906643.pdfIn PDF document text
    • https://cdn.sqhk.co/disidudi/DqIgdgi/black_car_wallpaper_hd_for_mobile.pdfIn PDF document text
    • https://vetasokimatajed.weebly.com/uploads/1/3/5/2/135296406/banizakeb-nimej-momopasowixoli.pdfIn PDF document text
    • http://4338bacchus.com/67957465269qtlqr.pdfIn PDF document text
    • http://ig-about.net/vubijufepumodokatesosomizjq52.pdfIn PDF document text
    • https://pusesame.weebly.com/uploads/1/3/4/6/134662227/posoti.pdfIn PDF document text
    • https://widosutolitidaf.weebly.com/uploads/1/3/4/8/134847614/034bb0.pdfIn PDF document text
    • https://cdn.sqhk.co/nepofigiper/iABicJr/gas_station_prices_map_near_me.pdfIn PDF document text
    • https://tonavamajarow.weebly.com/uploads/1/3/4/6/134694337/fd1b6ea6c367.pdfIn PDF document text
    • https://buzufurabobozu.weebly.com/uploads/1/3/5/3/135304208/6800937.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/GiadjhZ/us_military_campgrounds_and_rv_parks_map.pdfIn PDF document text
    • https://xedaloroxolujig.weebly.com/uploads/1/3/4/0/134018039/folokixowex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/timeziso/fejuko.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/sisunerasasifibala.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/fenaj.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/systems_of_equations_substitution_and_elimination_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/sosirasogasuxuniwejogapa.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/ielts_reading_test_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/anganwadi_karyakarta_bharti_form.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/3d_printing_technology_book.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_off0000dbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAE 5176 bytes
SHA-256: 3fcc066b081c658e644986067115ee02c14bebc186ff390fb321445d40feb4d9
font_01_sfnt_off0000ed7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7D 10252 bytes
SHA-256: 1fa12bf393f073ff52cf1450570c403de2b1bfd1145c0c46ae885985e3dbab0f