Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a48f3c3574cbec…

MALICIOUS

PDF

72.2 KB Created: 2021-03-16 15:52:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f858ba1313743e94fda14adde43572aa SHA-1: 9cdbcf02442378b89180c2321011c90787481d80 SHA-256: c6a48f3c3574cbecc3134dbfd508c2bc3bb39384b6bc91f6261813b59add9d27
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://fokemale.ru/wix?keyword=technology+rocks+seriously+hundreds+chart PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382187/normal_6023af408b859.pdfIn PDF document text
    • https://dakewamegiru.weebly.com/uploads/1/3/5/3/135305658/9e7f07e7b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391896/normal_5fcb1d590c563.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427529/normal_5ffcefcb1478a.pdfIn PDF document text
    • https://gowoxavakuf.weebly.com/uploads/1/3/4/7/134702457/karugumuzekum.pdfIn PDF document text
    • http://modozadubop.mywebcommunity.org/what_are_the_rules_of_sentence_structure.pdfIn PDF document text
    • https://kitikifotise.weebly.com/uploads/1/3/5/3/135321604/lopodom-detedumal.pdfIn PDF document text
    • https://cdn.sqhk.co/kagelemovo/wDzgdgi/mi_musica_de_apple_music_desaparece.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/1jeihgd/56917669704.pdfIn PDF document text
    • https://jiwuzutobaduf.weebly.com/uploads/1/3/4/8/134889186/7588200.pdfIn PDF document text
    • http://fanutoragozogow.sportsontheweb.net/respiracin_celular_aerobia_y_anaerobia.pdfIn PDF document text
    • https://totaguzoxexidi.weebly.com/uploads/1/3/2/7/132741029/fuleta_dinutoneruletat_vifeke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://surewefuwiba.rf.gd/bejixefor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32337500-bd8a-4633-b10a-6d83fec4fb84/lalowabim.pdfIn PDF document text
    • http://kipalinuki.rf.gd/date_sheet_aiou_2019_b._com.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/243158ca-e77d-455d-8a1d-9124a198e6b6/sb_800_right_to_repair_act.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7f0581a-df2e-4487-8343-ac5829b04437/xowinopowete.pdfIn PDF document text
    • http://ridizovidibafi.rf.gd/general_ledger_accounts_examples.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_off0000e000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE000 5316 bytes
SHA-256: c703bb6fbb9dd3e63a826c1f94c0d1cd8be6d74773a9ea3de450490b0b3ef8a5
font_01_sfnt_off0000f216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF216 9764 bytes
SHA-256: 314c2b709a126b5a58564ccda1b9ea6d262d796949fa1b4696b8e313d9010184

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