Malicious PDF — malware analysis report

Static analysis result for SHA-256 b348e0e382b3175c…

MALICIOUS

PDF

76.1 KB Created: 2021-05-23 18:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a3cc3290ee02f829f379378d00f66a72 SHA-1: e4bfd550a3d073a026eb29f4d7b6a60283d2b1b0 SHA-256: b348e0e382b3175c86d9ed0ba11cb06ec8ba4380b21207b9d2171c2d0300e414
214 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs, particularly the one pointing to dafemum.ru, are associated with malicious redirector infrastructure, suggesting a phishing or scam campaign designed to lure users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to distribute malicious content or lead users to phishing pages.

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 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.
  • 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://dafemum.ru/strik?utm_term=abortus+deformisanog+ploda+u+islamu In PDF document text
    • https://cdn-cms.f-static.net/uploads/4401696/normal_60206269c6bb2.pdfIn PDF document text
    • https://rowigimafusapop.weebly.com/uploads/1/3/5/9/135982222/baluzuzu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454426/normal_60183ef683e78.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374951/normal_5fdeaf5c6066e.pdfIn PDF document text
    • https://wirosumarot.weebly.com/uploads/1/3/1/3/131398493/6826511.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405467/normal_60432f278dcea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448976/normal_602f36f1435f9.pdfIn PDF document text
    • https://jumufewaxijakuk.weebly.com/uploads/1/3/1/3/131380308/1096781.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374840/normal_5ff967903f30c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370299/normal_602070901e9c1.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/gudukupir/kimag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa6863e6-fca3-4048-ac33-1265b70a4d63/bearcat_880_antenna.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/clash_of_clans_apk_apkpure._com.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/dezekebe.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/budowusigekipib.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/68998443484.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/96466200834.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/93796121156.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f2b61d4-9cc5-4b5b-98c2-3fa16b70baaf/python_check_if_dictionary_contains_keys.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_off0000e9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B7 5492 bytes
SHA-256: 08416812e90f08fd60918e7ffb96c1a7237764356c9e2101e1226c5473d6c93f
font_01_sfnt_off0000fc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC45 11628 bytes
SHA-256: 870d9f93b1a0c91a29f2cc0ca0140e52689f0c0744bf45f8109e4285938cfeaa

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