Malicious PDF — malware analysis report

Static analysis result for SHA-256 5587ae0779cbcd3d…

MALICIOUS

PDF

82.7 KB Created: 2021-05-23 22:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 2a86495b1304c2b6359083883454648f SHA-1: 2d1b1cf269a0dafb6eb4d5b79e04c1a77f484e0d SHA-256: 5587ae0779cbcd3dcedbb33530bd96414e43d043b927bb83d0905477b7f86f41
222 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to a URL that appears to be a lure for a 'hack tool'. Additionally, the ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan. The presence of numerous SEO-optimized PDF links suggests an attempt to distribute malicious content or engage in link farming.

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crophysi.ru/strik?utm_term=sniper+3d+assassin+hack+tool+free+download In PDF document text
    • https://static.s123-cdn-static.com/uploads/4459640/normal_5fde545ca2239.pdfIn PDF document text
    • https://mimuromujalu.weebly.com/uploads/1/3/0/7/130739347/rodefe_nojipu.pdfIn PDF document text
    • https://gifivetusox.weebly.com/uploads/1/3/4/7/134736849/92305.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453901/normal_5fe5177823357.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379854/normal_5fdb76c2b57c1.pdfIn PDF document text
    • https://fedubipogumuwu.weebly.com/uploads/1/3/1/3/131379546/mogofefi.pdfIn PDF document text
    • https://wogakidip.weebly.com/uploads/1/3/5/3/135384189/fafiditore.pdfIn PDF document text
    • https://kuxorife.weebly.com/uploads/1/3/5/3/135313812/324fac4b91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500893/normal_5fffd6192adf2.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/nefunupu/ge_water_softener_model_gxsh40v_00_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/queen_mab_romeo_and_juliet_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/nancy_drew_and_the_hidden_staircase_2019_soundtrack.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/46633694635.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/edakkad_battalion_06_malayalam_song.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/symmetry_worksheets_ks2_free.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/font_awesome_zip.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/list_of_best_android_phones_for_gaming.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/64241049735.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/behringer_xenyx_1202_fx_send.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/89815821972.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/federal_polytechnic_auchi_hnd_form.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/simple_spreadsheet_app_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/soundcloud_premium_free_android.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/bartolinitis_tratamiento.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_off0000f7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BB 5668 bytes
SHA-256: 59eacd35fc58100ddcc3afecb6357345ef51fd17a1b1e32e325379b86e81d212
font_01_sfnt_off00010b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B14 21108 bytes
SHA-256: 7155588302d77fdeaca113f7efc45586c258b95791a028fbf3b6d3064c7260eb

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