Malicious PDF — malware analysis report

Static analysis result for SHA-256 72a4e5ef85734e0f…

MALICIOUS

PDF

72.1 KB Created: 2020-11-16 15:24:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c8d013052b0394d846f6907d4626c5ef SHA-1: dc6730e054a9ddbdfcddf5854b006a3818347498 SHA-256: 72a4e5ef85734e0f7157fbe206ebfdd5891b799764e3fd5db47de87a2a49b600
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable domains and redirector services, indicating a link farm designed to distribute malicious content. The heuristic firings confirm the presence of malicious redirector links and a link farm on disposable hosting. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gettraff.ru/strik?utm_term=pool+games+unblocked+at+school In PDF document text
    • https://tusefekojeseto.weebly.com/uploads/1/3/4/4/134437698/e97d69e4b60.pdfIn PDF document text
    • https://numobokofe.weebly.com/uploads/1/3/4/5/134501802/2156431.pdfIn PDF document text
    • https://dokakida.weebly.com/uploads/1/3/1/3/131380589/vumadamesubijiponazu.pdfIn PDF document text
    • https://tidufafedufokaj.weebly.com/uploads/1/3/4/6/134693038/28286bf82f44.pdfIn PDF document text
    • https://terarawuterojuz.weebly.com/uploads/1/3/0/7/130739827/8fa602dca.pdfIn PDF document text
    • https://towetebofipu.weebly.com/uploads/1/3/1/4/131437669/fff884f3706.pdfIn PDF document text
    • https://vuxutuwatojo.weebly.com/uploads/1/3/4/6/134625262/3057855.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dowavelaxam/vonolizu.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/2017_bmw_4_series_convertible_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47e62e3c-7d9e-4281-a0c6-77fb86b5f481/nevirefunalaf.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/how_to_make_balloon_animals.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD007 5296 bytes
SHA-256: fd8f4ed56db1c8145f7ef578dd552e7209d23cdf3534227affc0432a309c3b32
font_01_sfnt_off0000e1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E2 10656 bytes
SHA-256: 82885915c5164633c911b1a74d12b21fcdeaf1ee5f667431bd651e9ed530f430
font_02_sfnt_off00010597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10597 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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