Malicious PDF — malware analysis report

Static analysis result for SHA-256 837498f78d997205…

MALICIOUS

PDF

76.9 KB Created: 2021-03-01 17:28:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 317947ad3054d484eba5744faa073b3b SHA-1: b3622f863ea4c8c573d7d829fc0f5be2a8254b14 SHA-256: 837498f78d997205eb49d53680ef431f161adef304d37d55c49f46a96cb74a98
104 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of an external URI pointing to a suspicious domain, coupled with a heuristic for a visual download button, suggests a phishing or social engineering attack. The document likely aims to trick the user into downloading a secondary payload, as indicated by the PDF_URI heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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
  • 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://crophysi.ru/wix?keyword=made+easy+environmental+engineering+book+pdf PDF link annotation
    • http://zanartcc.net/83607352203fzsrb.pdfIn PDF document text
    • http://mexicotop.xyz/betezulemafajefiwon4ispz.pdfIn PDF document text
    • http://tortomsk.ru/xejomafosaraxemabodow5ntd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465142/normal_601983d2ec886.pdfIn PDF document text
    • http://evromotors.net/why_marx_was_right_summary02t8w.pdfIn PDF document text
    • https://cdn.sqhk.co/noretokujazo/PKgg2rw/lonogan.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/dnidiiW/how_do_you_activate_fury_in_dead_island.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407813/normal_5feff558bc809.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_6017f716031a0.pdfIn PDF document text
    • https://cdn.sqhk.co/biwopeka/iVDF6f8/raid_boss_destiny_titles.pdfIn PDF document text
    • https://cdn.sqhk.co/fafaviwi/Xhia2gd/led_controller_battery.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422893/normal_600e4efbbd424.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485930/normal_5fcc1f25a96ff.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/gusule/how_to_run_a_chick_fil_a_franchise.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/jukuvu.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/goldsmithing_guide_ffxi_nasomi.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/79560100468.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46F 5732 bytes
SHA-256: 23def2ddcbcece1ba592fc02f69dcc16789baa4bdd044c3b46b70fa46a635926
font_01_sfnt_off0000f7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F4 2080 bytes
SHA-256: 7f5b718fd96f57a2153e301ddc7dd89e5fcdea4933e749ab3aeacdebfd26f085
font_02_sfnt_off0001018e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018E 10624 bytes
SHA-256: 76bb767db9dfb701a22e22e6ef568f49544ba8f4fbfd7260e0ffc56b37caf1fb

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