Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbd6470ebd60ef61…

MALICIOUS

PDF

69.6 KB Created: 2021-02-13 20:42:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: db4a250accb608768cb7d39c8153f9ac SHA-1: aea5fb2a56e574442769938f4991a928b3f9ecd5 SHA-256: bbd6470ebd60ef61c14f916bd243ff6cd672fd4e43d3950b2d29cba9df8d092a
242 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links pointing to external PDF files hosted on various domains, many of which appear to be disposable or part of a link farm. One critical heuristic indicates a link to known malicious redirector infrastructure. The ML classifier also flagged this PDF as malicious. This suggests the document is designed to lure users to malicious content, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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.
  • 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.
  • 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/aws?utm_term=bahishti+zewar+complete+english+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4383795/normal_5ff496da97fd4.pdfIn PDF document text
    • https://kakituku.weebly.com/uploads/1/3/4/5/134589995/2b64bb0e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371498/normal_5fde0d6f319d1.pdfIn PDF document text
    • http://all-system7.club/xupelokeladanojazerupini74ajk.pdfIn PDF document text
    • http://islandlandscapesbb.com/best_bodybuilder_imagese5zjd.pdfIn PDF document text
    • https://cdn.sqhk.co/vawadawuleja/frLhgCk/arknights_characters_tier_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387698/normal_6012f60912f28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418379/normal_5fd1c096e6644.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_601904fed4bee.pdfIn PDF document text
    • http://just-gopro.com/pizokelopokavoklskt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368504/normal_5fe1cf6964a45.pdfIn PDF document text
    • https://fuwofinirofen.weebly.com/uploads/1/3/1/6/131637723/suwunedix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482872/normal_601efea446383.pdfIn PDF document text
    • https://cdn.sqhk.co/vedisaso/iO7mjiR/2020_election_candidates_list_georgia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383912/normal_6012a43c40a52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454043/normal_6015190c4f919.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387562/normal_5ff5441dbb5d2.pdfIn PDF document text
    • https://toposizijud.weebly.com/uploads/1/3/0/7/130776562/navareburewulop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481161/normal_5fe18269330b2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FB 5760 bytes
SHA-256: 8d9b13d76fede5a9121efcdc05f4f9bd539809bafe95cd5f17c7b874d3842228
font_01_sfnt_off0000fb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7F 5672 bytes
SHA-256: 7b421024b5df3a5108a7d7a9d72c8f0d840718b413dcac5ebb75690c42440f66

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