Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ffd5f35966a173…

MALICIOUS

PDF

80.5 KB Created: 2020-12-04 14:17:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 7233c68e6cac8e1ecfcf3c93f5a9fc34 SHA-1: 973e092924d3b344f4d21c8eccdaeff6937e6351 SHA-256: 61ffd5f35966a173a13c0438dfaa33ab9e4c62bdb9723d3b4b68aec43b1a5eed
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 and routes users through malicious redirector infrastructure. 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
  • 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://traffmen.ru/strik?utm_term=goal+zero+sherpa+50+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375891/normal_5f98e373b7984.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376870/normal_5f9d39778d58f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375887/normal_5fb26cf38f798.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484115/normal_5fc3af09aa309.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366665/normal_5f9235f467e0b.pdfIn PDF document text
    • https://ziperivowupidu.weebly.com/uploads/1/3/1/3/131381589/zozepelomolopo_xetadu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409092/normal_5fb5e0ce33a72.pdfIn PDF document text
    • https://tokenabasefegaw.weebly.com/uploads/1/3/3/9/133999291/mijenowoluf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424630/normal_5fca04fcddf55.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408174/normal_5fc84ddea0e24.pdfIn PDF document text
    • https://jabiratunibi.weebly.com/uploads/1/3/2/6/132683422/1373542.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe29e2f8cdb769c6ace9a4/1606298099315/child_labor_exploitation_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/57320474688.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/z390_aorus_master_user_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5386f3dfdd95b60f16c7a/t/5fc76a0c56cd4459b3b85f55/1606904333027/financial_times_free_student_subscription_offer.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000e426.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE426 15124 bytes
SHA-256: b18db232d260139ae21ece93a7c8db4ddf582b2b46a0ede23198e3a0dcb80507
font_00_sfnt_off0000d1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F0 5408 bytes
SHA-256: 06b829dc1328b3d800594269a4bdbc60a4e9a2d67fd49588e199ecc9d59a6af6
font_02_sfnt_off00010d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D53 11788 bytes
SHA-256: caf847155e6a351a09ae912bde2917cd782aa40583fa13604209d2f2dbe847a0

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