Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b13c9b00e1fe7c5…

MALICIOUS

PDF

69.6 KB Created: 2021-01-08 08:04:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b6c6437032afe5aae0a3bbfeab9eef87 SHA-1: e688f526c20c77ebe320b28189e5b1c3700ece44 SHA-256: 0b13c9b00e1fe7c5a4ba8afe4807054c5d34a0f2180a391c8b34bcde20b22126
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 contains a large number of embedded links pointing to external PDF files hosted on various disposable domains. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one of these links directs to known malicious redirector infrastructure. The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing or trojan PDF. The primary purpose appears to be to lure users to malicious content via a link farm.

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://cctraff.ru/aws?utm_term=llyn+crafnant+fishing+reports In PDF document text
    • https://wanowozuvigamo.weebly.com/uploads/1/3/0/7/130738859/d5b6baaa8.pdfIn PDF document text
    • https://rewajugelawuz.weebly.com/uploads/1/3/0/7/130738764/48e59e.pdfIn PDF document text
    • https://napifilimikap.weebly.com/uploads/1/3/1/6/131606974/0213e.pdfIn PDF document text
    • https://duzufekiwavana.weebly.com/uploads/1/3/4/6/134609718/fanovejunoxe.pdfIn PDF document text
    • https://dajexave.weebly.com/uploads/1/3/4/3/134352807/jigowakedeler-mekowapusowukox.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/iahihaW/wuzumawekuraforugovin.pdfIn PDF document text
    • https://wepuporo.weebly.com/uploads/1/3/2/7/132741302/lalezak_sedefus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381101/normal_5f9aab24d16d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483338/normal_5fddbdf31fa5a.pdfIn PDF document text
    • https://cdn.sqhk.co/tukawezezo/gjAibhg/tamil_dictionary_app_download_for_mobile.pdfIn PDF document text
    • https://rodinesupogoj.weebly.com/uploads/1/3/1/3/131384539/zepubativuse.pdfIn PDF document text
    • https://cdn.sqhk.co/pepegejivo/SPUkrZZ/89267239656.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483608/normal_5fbeedcf8ca46.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_off0000d17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17B 5320 bytes
SHA-256: 65c2e9744845635396cc53863f1e1749c26a2f65f9d2480a3097f1393f4d5e9c
font_01_sfnt_off0000e3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A0 11104 bytes
SHA-256: bff66370d1244ef011e53000f2720d202c9c55abaa00e4e9b3ce0530b003615a

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