Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e5d37f9fab9275e…

MALICIOUS

PDF

69.2 KB Created: 2021-02-19 05:54:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cbd3b2e12e5778f8f1248d92ae6f570b SHA-1: fa4678001c04b1e113480ed55fc872634f0791c5 SHA-256: 7e5d37f9fab9275ebeede1dccd34f7d207cd45f84e2605a7ccfe0c605c3815fa
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to calculating pump and motor efficiency, suggesting a lure to disguise the malicious links. No scripts were extracted, but the presence of malicious links points to a phishing or malware distribution attempt.

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 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/123?utm_term=how+to+calculate+combined+efficiency+of+pump+and+motor In PDF document text
    • http://sellamorem.com/rulifomipamusv5kib.pdfIn PDF document text
    • http://zodezabazigojab.iblogger.org/17912621668.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369760/normal_5ffa73bae44b5.pdfIn PDF document text
    • http://deutschebank-meine.com/gerabefuypa4i.pdfIn PDF document text
    • http://arevakar-travel.com/sopoxazaat.pdfIn PDF document text
    • https://cdn.sqhk.co/bozogekeji/nicgft5/2pac_hit_em_up_2_lyrics.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478398/normal_5fc84c09b4cd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414332/normal_5fe9390136c04.pdfIn PDF document text
    • https://cdn.sqhk.co/tobepeliv/ifhamjb/97994799411.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365635/normal_6020936fa0fc1.pdfIn PDF document text
    • http://svoydvalend.xyz/bedalemememanatuzonei6cw.pdfIn PDF document text
    • http://jirafka.space/25931795528pf8cn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371244/normal_6017b808c1ca2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380405/normal_5fcd40286eb68.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://viladanus.epizy.com/akreditasi_rumah_sakit.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/83816641848.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_off0000d1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DE 5416 bytes
SHA-256: 677ab6bdc65d8bc488ec4d11b988c8416b3a827208af8b5198d0f09ffe7ddd57
font_01_sfnt_off0000e44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44B 10272 bytes
SHA-256: fe93a992d5cea309d81c14bf252a366fa0e08417e3f4bb1d1b21724989dcc62e

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