Malicious PDF — malware analysis report

Static analysis result for SHA-256 09be82fd974abb4a…

MALICIOUS

PDF

75.3 KB Created: 2021-01-31 21:08:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d226631baca08467bf1e6bdba55e220f SHA-1: a2bda44af18ceed602b24e9f34e5b49c2383d523 SHA-256: 09be82fd974abb4a00f0313bb3a4b55ac7272bc51851001c1227fc3ac76391d5
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to external PDF files hosted on various domains, including known malicious redirectors. The primary purpose appears to be directing users to potentially harmful content, likely for phishing or malware distribution.

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/aws?utm_term=1+cup+oatmeal+nutritional+information In PDF document text
    • https://cdn.sqhk.co/xibumediw/SG3ge8R/degimolonagidoxapu.pdfIn PDF document text
    • http://lg-copyright.com/kubebadonhdtf2.pdfIn PDF document text
    • http://legendbilisim.com/watch_star_wars_rebels_freeggz4k.pdfIn PDF document text
    • https://cdn.sqhk.co/koluvukirate/jGjgp6X/6451554361.pdfIn PDF document text
    • https://cdn.sqhk.co/kirovuwuvo/C9Kii3J/nunifonigilogare.pdfIn PDF document text
    • https://wonikisemuk.weebly.com/uploads/1/3/4/9/134902350/dobewel.pdfIn PDF document text
    • http://reawolt.online/7129523190094nzl.pdfIn PDF document text
    • https://cdn.sqhk.co/bibolaned/ffvibhb/sifimijolisag.pdfIn PDF document text
    • https://bawokopo.weebly.com/uploads/1/3/1/0/131070727/913fca6d1a.pdfIn PDF document text
    • http://tofuvuniz.iblogger.org/xuwibesubutebusim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464327/normal_5ff7c93146fef.pdfIn PDF document text
    • http://ig-copyrightnotice.com/sobre_carta_reyes_magos411s3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duvipegi.epizy.com/getac_f110_spec_sheet.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE900 4940 bytes
SHA-256: f83dbaf7e548db4c58ebc7aa9f5587289ab8f8b40479f4cbd46e15de10bf3c01
font_01_sfnt_off0000f9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BE 11396 bytes
SHA-256: feba9198c3aca764d59f82b9b4ef968a09b2e38b228601e221b34d56643a2d38

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