Malicious PDF — malware analysis report

Static analysis result for SHA-256 11efc74bdb9ee412…

MALICIOUS

PDF

75.9 KB Created: 2020-12-19 20:52:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 44a3420c4a2b0e34c0e8b7a39ca990e6 SHA-1: 0d2347b1c1b0d978278d0be1e092ecc6559f8434 SHA-256: 11efc74bdb9ee41211d7054d982686c94c2833963b5b3362872b0ccba5410f2f
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic firings indicate a malicious redirector and a link farm, suggesting the document is designed to lure users to potentially harmful websites. No scripts were extracted, but the presence of malicious links is sufficient evidence of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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://ggtraff.ru/strik?utm_term=invisible+letter+copy In PDF document text
    • https://fowuwulavo.weebly.com/uploads/1/3/4/7/134754099/nuzedajotofofitekunu.pdfIn PDF document text
    • https://renobikedasel.weebly.com/uploads/1/3/4/8/134897329/7e21b82828fa636.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386594/normal_5fa9c8b040519.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371788/normal_5f88f0a74b84b.pdfIn PDF document text
    • https://loniforuwo.weebly.com/uploads/1/3/4/9/134904684/113000bcab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe35ba9b1ed03538a5bcba/1606301115008/mansfield_and_arnason.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/instruction_guide_for_proof_of_citizenship.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf4f2145a8629dc760121/1606284530850/sims_3_cc_hair_colors.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/bunub.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/18544387301.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23544dc0-0a55-44eb-a1c9-7bb923cd81b4/64509622261.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/spin_chat_app_apk.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC927 4744 bytes
SHA-256: 294e3e37f6eb34889fc774ea1653e2bd360c98abef10eb1e49a49c0281833646
font_01_sfnt_off0000d94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94A 11388 bytes
SHA-256: 74a3231abc368b0d37db8f336b8182a6be8ab16a26431de891b621df8a1f7584
font_02_sfnt_off00010001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10001 16040 bytes
SHA-256: 3a589d855f1d14f8bd7dfb5441031b700e03fff6c4469c9568392fbabbfe2112
font_03_sfnt_off0001147a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147A 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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