Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa7267fefa24cb34…

MALICIOUS

PDF

69.2 KB Created: 2021-02-25 08:28:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 28ee23d67c981985fd1105af2b1f1ae1 SHA-1: 09f41f5e0cdefc4bbc714937251c7387f4baffd1 SHA-256: aa7267fefa24cb34fc098b853b13b3283332a0f719ea71fa2edcc40353a6299d
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on disposable domains, indicative of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. ClamAV also detected this file as Pdf.Phishing.Trojan, and an ML classifier flagged it with high confidence. While no scripts were extracted, the structure and heuristics strongly suggest the document is designed to lure users to malicious sites or for SEO manipulation.

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/award?keyword=polycom+soundstation+2w+expandable+vs+non-expandable In PDF document text
    • http://wijetaz.mypressonline.com/bikevibalijutit.pdfIn PDF document text
    • http://lomigakorak.getenjoyment.net/how_to_read_a_metric_architectural_scale_ruler.pdfIn PDF document text
    • https://cdn.sqhk.co/lirebirab/eyidhjW/fozagagedejapisabasiki.pdfIn PDF document text
    • https://kesuvovim.weebly.com/uploads/1/3/5/3/135317554/rinatuweramojexego.pdfIn PDF document text
    • https://wimitefadekox.weebly.com/uploads/1/3/4/5/134586198/zixojozi_xepijode_nadovorarexadow_rovebop.pdfIn PDF document text
    • https://wuxagukokixeg.weebly.com/uploads/1/3/5/3/135398542/janemekovejipas_sewukumisaf_belosupetaguro_rudejekijod.pdfIn PDF document text
    • https://wexivupesowapab.weebly.com/uploads/1/3/2/7/132712225/792b8.pdfIn PDF document text
    • https://cdn.sqhk.co/dolitife/giiaaFV/banco_do_brasil_santos_dumont_fortaleza.pdfIn PDF document text
    • http://nesorus.mywebcommunity.org/33141622887.pdfIn PDF document text
    • https://gunajogozezulom.weebly.com/uploads/1/3/5/3/135385825/7816319.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/46154144547.pdfIn PDF document text
    • http://kakasis.onlinewebshop.net/dasoxopusonagovij.pdfIn PDF document text
    • https://s3.amazonaws.com/taguxif/how_to_choose_a_baseball_bat_size.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_off0000cfdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDC 5752 bytes
SHA-256: f4adb3d3324b968abe6c3e9bfd7443384fdeacffe6b15de935ec9afe7b609eee
font_01_sfnt_off0000e389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE389 10504 bytes
SHA-256: b4b9c016831f51f71cb43c1dc39f3cf97a8fed1e9cf8ede637d0d588130d1f8f

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