Malicious PDF — malware analysis report

Static analysis result for SHA-256 899c5f6fb381f9f5…

MALICIOUS

PDF

74.4 KB Created: 2021-02-26 00:42:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 364c9b2f7e3375ded2a86da23ea575dd SHA-1: beb009fd65761a45545f3c3a22390b9cf849a0fc SHA-256: 899c5f6fb381f9f511b73dbc6ec7286494102a853a937d8972096236e7907bae
230 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains numerous links to external resources, with a significant portion pointing to known malicious redirector infrastructure. The presence of a 'Snapchat apk update' keyword in one of the URLs suggests a lure for potentially unwanted or malicious applications. The document's structure and the high number of outbound links indicate a link farm or phishing attempt designed to direct users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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
  • 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://yafferge.ru/wix?keyword=snapchat+apk+update In PDF document text
    • https://static.s123-cdn-static.com/uploads/4485576/normal_6005ec3e0469e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485696/normal_5ff410573463d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419827/normal_6003dbea22c7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388282/normal_5ff1944ada267.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445125/normal_5fcdb4197a30f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367643/normal_6036328833dff.pdfIn PDF document text
    • https://suridivulav.weebly.com/uploads/1/3/5/3/135312357/e8e196bf83e38.pdfIn PDF document text
    • https://dapapakutuluj.weebly.com/uploads/1/3/1/3/131384169/5875107.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445341/normal_5fe02c6cbfafc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465702/normal_5fd914f1c48c1.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/sitozi/categorizing_worksheets_middle_school.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/idsa_guidelines_diabetic_foot_ulcer.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/cataclysmic_transformation_light_novel.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/praying_for_enemies_to_die.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/85644079543.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/inglourious_basterds_movie_hd.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_off0000e656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE656 5024 bytes
SHA-256: 8c08fdb9b12e47113c7e095d6c62b8e37ef4d33d81fc1cc00c375b42c8ccd37b
font_01_sfnt_off0000f76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76A 10964 bytes
SHA-256: 720cd48aed347303418fc6359b5989f3d33843cc3291b5580cfab86a34eb209c

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