Malicious PDF — malware analysis report

Static analysis result for SHA-256 810a06565f376f3f…

MALICIOUS

PDF

76.8 KB Created: 2021-02-04 07:59:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 09b73a99105d7b22b9c602f80b8150fd SHA-1: 3e9e9698b74bc42ba14238a163794c8c6f2e7606 SHA-256: 810a06565f376f3f61102a1d6455e7425e5f7a1626039f903c4d42d2a59bc9bf
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, forming a link farm. One of the initial links directs to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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://yafferge.ru/wb?keyword=borderlands%20pre%20sequel%20wilhelm%20skill%20tree%20guide In PDF document text
    • https://nodararikerat.weebly.com/uploads/1/3/4/8/134885074/9013541.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485946/normal_5fd37fcb07f27.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414682/normal_5ffb16eb8c850.pdfIn PDF document text
    • http://dixojele.22web.org/animation_movies_free_tamilrockers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374689/normal_5febdbb792a5b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445892/normal_5fe1a29eed8c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374175/normal_5ff5034a1563f.pdfIn PDF document text
    • http://jokidinavefo.22web.org/23041780302.pdfIn PDF document text
    • https://cdn.sqhk.co/sojowidaz/XjfggjX/college_road_trip_movie_songs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380540/normal_6015f1ca58653.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476567/normal_5fc807899e044.pdfIn PDF document text
    • https://dusonibegoxat.weebly.com/uploads/1/3/1/3/131380688/nubizolajunixafu.pdfIn PDF document text
    • https://liruviwogaralo.weebly.com/uploads/1/3/0/7/130776788/8944335.pdfIn PDF document text
    • https://lowarimubabop.weebly.com/uploads/1/3/4/7/134712264/lebovanakovovax_vetivi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gaditerigasut.rf.gd/astrill_vpn_android.pdfIn PDF document text
    • http://watokugen.epizy.com/87252879791.pdfIn PDF document text
    • http://vutekumini.epizy.com/60171911269.pdfIn PDF document text
    • http://buwumipulufi.epizy.com/60462881881.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_off0000ee05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE05 5704 bytes
SHA-256: 372d2181dec679ec9eecc35a42a4e3ad0a4afdea23a4646c536833f0ae4339eb
font_01_sfnt_off0001014d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014D 10656 bytes
SHA-256: f83fae66b8a2c95fdd760696157547cae48e3e805c0b43b4ad99bc9e61a22c70

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