Malicious PDF — malware analysis report

Static analysis result for SHA-256 359a9241c2a884e7…

MALICIOUS

PDF

74.7 KB Created: 2021-02-14 19:02:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 62841e6a658ec7d1301477aeb99027d9 SHA-1: 254891c7c512f4b7a817f05cfe0ea9b64bee41f0 SHA-256: 359a9241c2a884e7be3f7e92cac2de525a41ee48f14dd25a5c5fdf604ff98048
254 Risk Score

Malware Insights

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

The PDF contains numerous embedded links designed to redirect users to malicious websites, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The primary redirector URL identified is https://yafferge.ru/wix?keyword=best+url+shortener+to+make+money+2020+in+pakistan. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=best+url+shortener+to+make+money+2020+in+pakistan In PDF document text
    • https://cdn.sqhk.co/zukasedu/ghgjLtg/nugukanuxoxow.pdfIn PDF document text
    • https://cdn.sqhk.co/jerivudofin/jghfsWx/teduribelujajo.pdfIn PDF document text
    • https://cdn.sqhk.co/javijaxim/rshhhex/private_number_iphone_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/kerosumumato/jaM9F23/42989163829.pdfIn PDF document text
    • http://weinmvc.net/65854698452yuxst.pdfIn PDF document text
    • https://cdn.sqhk.co/lorotukogof/AkS4geO/87691594662.pdfIn PDF document text
    • http://manthoughtswebsite.website/110537225595prb3.pdfIn PDF document text
    • https://cdn.sqhk.co/ributexovek/jhjege3/lepanefoxorokezuvoriwo.pdfIn PDF document text
    • http://sale20.site/76435848530787a7.pdfIn PDF document text
    • https://nuvarimo.weebly.com/uploads/1/3/1/3/131378817/polivezakakezafufiw.pdfIn PDF document text
    • https://cdn.sqhk.co/goronikel/7hcgejE/56873722097.pdfIn PDF document text
    • https://cdn.sqhk.co/tezizejaropu/iiiawjU/40673996997.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexofap/idNjhgf/34747529988.pdfIn PDF document text
    • http://mamontov-net.cc/punnett_square_practice_middle_schoolxaqpi.pdfIn PDF document text
    • https://cdn.sqhk.co/tevenijubuso/j3Oiihf/4265423057.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61D 5548 bytes
SHA-256: 6ec59777ac7d4b6a8c89352587352e7ba0b8dc14a9e5ce66f00bdb3d96dcc0fa
font_01_sfnt_off0000f8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D0 10756 bytes
SHA-256: 752e6796e29eaf9f3a4bbabdf780aec5f4b07e35b2ef9e9ee937af2318e4631b

Open this report in the interactive analyzer, or submit your own file for analysis.