Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5eb815b82de7f70…

MALICIOUS

PDF

78.1 KB Created: 2021-03-02 11:42:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fe2d0961a3950f3ab3ff34703b2f445c SHA-1: adde2f694982aef1bdbcefd9c8efa57f588a2637 SHA-256: d5eb815b82de7f7082e24752ba8f32e5d1422697636f2dd1f0eda07f78671403
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one specifically pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to academic topics, likely to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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=double+sided+absolute+value+equations In PDF document text
    • https://cdn-cms.f-static.net/uploads/4467601/normal_603c1468b545c.pdfIn PDF document text
    • https://jonipafatanepa.weebly.com/uploads/1/3/2/7/132741476/dijub.pdfIn PDF document text
    • http://chtotakoeverti.biz/cloud_9_vapor_raleigh_ncs5vfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493579/normal_60266976d0219.pdfIn PDF document text
    • http://leyloften.online/best_2d_performance_video_carddq3mx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403276/normal_601130cf3d748.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446273/normal_60172f018477a.pdfIn PDF document text
    • https://solujasamaro.weebly.com/uploads/1/3/4/6/134695729/e2bfdc7a2566.pdfIn PDF document text
    • https://rowemuvirota.weebly.com/uploads/1/3/6/0/136089617/63fe0e4023.pdfIn PDF document text
    • http://potawuzaj.medianewsonline.com/sejikozoxikanozizapeketi.pdfIn PDF document text
    • http://artrosil.xyz/431499263316rqht.pdfIn PDF document text
    • http://ravigimojamel.mypressonline.com/poxegotosekerafaxakop.pdfIn PDF document text
    • https://zawoxabupuw.weebly.com/uploads/1/3/5/9/135990747/a9a5afd831971ed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://joxupabazifo.rf.gd/gli_asolani_bembo.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_off0000f39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39E 5048 bytes
SHA-256: cee7ac4ad071a0bc2dfea384059c9e34ce4c33605d629b00186c505c53beb783
font_01_sfnt_off000104e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E1 11296 bytes
SHA-256: 4778b7c78db353a1f04cb3826673e8a5e0cd488baa85c0eaf79da2ea74111f19

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