Malicious PDF — malware analysis report

Static analysis result for SHA-256 f07e0d11aeb40359…

MALICIOUS

PDF

87.5 KB Created: 2021-02-05 23:42:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 75cfda5ad7f60583fd670df4fbfe4521 SHA-1: deb49fc9208984305df2bd85bb9d5d34dccddabc SHA-256: f07e0d11aeb40359808aba56b98de699f8a1ab195119fa0f00ce9c9703f1cad3
164 Risk Score
Tags
free-cdn-ebook-manual-lure

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 SEO-optimized, suggesting a link farm or content-luring tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point towards an attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/123?utm_term=can+eyelash+crested+geckos+eat+applesauce PDF link annotation
    • https://balikawe.weebly.com/uploads/1/3/4/6/134659528/94417.pdfIn PDF document text
    • https://cdn.sqhk.co/xufaribo/1Ehi7nZ/cute_mermaid_simulator_3d_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/ShgDih0/cross_stitch_christmas_cards_free_patterns.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376372/normal_601af1fbcef67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417315/normal_5ff944cf406ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403274/normal_600e01f03de36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369503/normal_6018382851d21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388041/normal_60094c500d165.pdfIn PDF document text
    • https://cdn.sqhk.co/sakupiraf/icigijm/free_printable_bible_word_search_games.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/wujodibu/bifojepug.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/97681598241.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/viguluwuwipefufapeguvo.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/formule_arrondi_excel_english.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/41511376085.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/30007979499.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/vba_copy_and_paste_values_entire_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/33199038283.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/brindisi_report_incidenti_stradali.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/structured_cabling_network.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/american_academy_of_orthopedic_manual_physical_therapists.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_off00011906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11906 5408 bytes
SHA-256: f5f55a8a166e85c5de7e00b06e6cf1480ac477db1260baab5134c6186f6cbb74
font_01_sfnt_off00012b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6D 10800 bytes
SHA-256: 545d354d914b74b953f100f81457698ab87933956131f84b3d54265cd0812807

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