Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b8a440d9ed572f4…

MALICIOUS

PDF

76.6 KB Created: 2021-03-26 05:19:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99c4394fa05e653dea2122b29cddfe2b SHA-1: 3b56086bf3d67c1d75a5546da67acd9ad6460f87 SHA-256: 2b8a440d9ed572f46ce561326f06e71760b6f495626e46915a5c9bba868855a8
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 of which are hosted on dynamic DNS services or link farms, indicating a phishing or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs, such as 'https://ponafet.ru/aws?utm_term=how+to+know+my+facebook+email+id', are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/aws?utm_term=how+to+know+my+facebook+email+id
    • https://cdn.sqhk.co/nowavutu/ijejbsG/46444998592.pdf
    • https://cdn.sqhk.co/defisepeniba/hW5Tehd/forager_starter_guide.pdf
    • https://cdn.sqhk.co/sadirorig/mibjggg/walajapiseri.pdf
    • https://cdn.sqhk.co/sarowojep/ghaldXM/swipe_basketball_y8.pdf
    • https://puralabeno.weebly.com/uploads/1/3/2/8/132814071/doguzawik.pdf
    • https://cdn.sqhk.co/gimanoretev/iiMgJFy/ordinance_or_law_coverage_c.pdf
    • https://cdn.sqhk.co/sitosuduf/bghifhf/rta_audio_analyzer.pdf
    • https://cdn.sqhk.co/pefevepufi/hglhh6r/free_robux_giveaway_tips_and_tricks.pdf
    • https://cdn.sqhk.co/rapowipijes/khgihgg/fosulawugulu.pdf
    • https://cdn.sqhk.co/jumupebuvi/gfjcfii/facebook_messenger_check_mark.pdf
    • https://cdn.sqhk.co/wefekoferu/L2ijjbS/79894463820.pdf
    • https://cdn.sqhk.co/jadepibake/qidGahh/18070537153.pdf
    • https://vujojetusifej.weebly.com/uploads/1/3/1/3/131398487/topideduxi_gobomof.pdf
    • https://cdn.sqhk.co/togixulala/Ijeib6f/manu_bleacher_report.pdf
    • https://cdn.sqhk.co/supesuvepo/NjccSib/ludo_king_online_game_download.pdf
    • http://fukerijinexin.mygamesonline.org/ascariasis_en_nios.pdf
    • http://vabademajelid.iblogger.org/49078292624.pdf
    • http://diluzadumavotux.getenjoyment.net/73441176474.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wugujub.onlinewebshop.net/sangean_rcr_5_digital_am_fm_clock_radio_manual.pdf
    • http://fazafof.rf.gd/a_companion_to_archaic_greece.pdf
    • http://xesapekaf.epizy.com/what_is_mind-mapping.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_off0000ecd2.bin
50bbd8a481158b8db0c5fbc2ef3f230a0e4f6bec7e5cb8b521a143ece07755e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECD2 5252 bytes
font_01_sfnt_off0000feb8.bin
e9a4e941be010019d0b920aaccb40437f4a11f100470b418bcd72ed999779303		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB8 11360 bytes

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