Malicious PDF — malware analysis report

Static analysis result for SHA-256 3599629b7e6faf76…

MALICIOUS

PDF

75.8 KB Created: 2021-04-05 07:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d33088fff9ff3040684e73425d650a1c SHA-1: 27c221585f22d19d0226e550b65d1c04cde9f5b8 SHA-256: 3599629b7e6faf76c255fcb4771a6d07f83b014e646ccee555cfeab6f61f9e0c
156 Risk Score

Malware Insights

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

The PDF file contains a lure for a free iPhone, directing users to a suspicious URL. The presence of numerous external links, identified as a link farm, and ClamAV detection as Pdf.Phishing.Trojan, strongly indicate a phishing or scamming attempt. While no scripts were explicitly extracted, the PDF structure and external links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://zajinet.ru/wix?keyword=how+can+i+win+a+free+iphone+6s
    • https://cdn.sqhk.co/kivipemo/yUjhOie/kidafodalatariforinoporeb.pdf
    • https://cdn.sqhk.co/gajerivab/hhcHvid/tagokoxivigifem.pdf
    • https://dapazigozasonim.weebly.com/uploads/1/3/4/4/134466252/76944d0775.pdf
    • https://cdn.sqhk.co/kowetitemaro/Jz3Gig0/pacific_bell_park_phone_limited_edition.pdf
    • https://jodawozuwiki.weebly.com/uploads/1/3/1/4/131437728/bcb50b07.pdf
    • https://rofofomigedug.weebly.com/uploads/1/3/4/4/134486696/8207944.pdf
    • https://cdn.sqhk.co/dejuxafe/6ObYR4I/14384737169.pdf
    • https://cdn.sqhk.co/pedidagow/HidigcC/72144765628.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7660223b-8bc0-4ebc-8be8-5fa48676b92e/beats_by_dre_wireless_headphones_how_to_connect.pdf
    • https://uploads.strikinglycdn.com/files/f168a82e-ad68-4e44-a69f-bd1b2435e920/rimas_y_leyendas_gustavo_adolfo_becquer_resumen.pdf
    • https://uploads.strikinglycdn.com/files/71440a52-dd49-4ab3-91ff-fab2a02d664e/dunajeroliwuwuvoligumu.pdf
    • https://88bec3ce-9cdd-4818-a95b-bcf8ac49d1e7.filesusr.com/ugd/72df48_7bda6f748acb421387193d4e9a9b0fbd.pdf?index=true
    • https://bbaef297-c986-4b42-acb3-0fd65605e280.filesusr.com/ugd/e9fc71_333f235c894c4f6ca9326f87aaf8be40.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7229f3d3-7f80-4af5-bc16-9d78692e407d/84496733882.pdf
    • https://uploads.strikinglycdn.com/files/76f9ff4c-10d5-4f43-9705-39b9ea8a8e99/robinson_crusoe_malayalam_book.pdf
    • https://uploads.strikinglycdn.com/files/864237ad-f66b-4e41-a9c3-9cead3c27109/hp_officejet_pro_8610_single_sheet_feed.pdf
    • https://83f018a0-8e49-44f0-b57e-805e464a5f06.filesusr.com/ugd/10a4aa_0a305efe18fd481b966b5f37e2ab16b1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6a4be88c-75a0-4d44-b0f8-767fe5d140c1/lagituwanutasuxisateluku.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9dd.bin
587d3bf25cc198435e2a8a6a4ab047fca90791caebd57cefce923fb57bc2d20d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DD 5276 bytes
font_01_sfnt_off0000fbe3.bin
651732a24ac641014926b9232caa3562561ecb998ee242387793700ecb53ca47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE3 11296 bytes

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