Malicious PDF — malware analysis report

Static analysis result for SHA-256 51edaa059a0d5565…

MALICIOUS

PDF

58.0 KB Created: 2020-11-24 02:00:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 829bda5cbe2963b9af248f358e094c5d SHA-1: 74ed4353dc977406e1e0d226d9798b50158b2f20 SHA-256: 51edaa059a0d556540ff8c1db63dccac670972f644d3a18d38204ab0f734f9f3
222 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a large number of external links suggestive of a link farm. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=electric+machinery+fitzgerald+download
    • https://cdn-cms.f-static.net/uploads/4393637/normal_5f99676ac40d8.pdf
    • https://pelusebilad.weebly.com/uploads/1/3/4/2/134234641/moxazokep.pdf
    • https://cdn-cms.f-static.net/uploads/4379987/normal_5f8f841b9e7db.pdf
    • https://cdn-cms.f-static.net/uploads/4371508/normal_5f9ba4941e328.pdf
    • https://saniruguroxi.weebly.com/uploads/1/3/4/5/134585545/jorogebuku_sofelukiku_bevugelawesak.pdf
    • https://tojaluteder.weebly.com/uploads/1/3/4/3/134384479/nizumi-vetolureg-rofeteromija-nujiwe.pdf
    • https://cdn-cms.f-static.net/uploads/4383327/normal_5f8eed0d19c40.pdf
    • https://soxajenukaru.weebly.com/uploads/1/3/0/8/130874283/wafomigijozekowo.pdf
    • https://cdn-cms.f-static.net/uploads/4469847/normal_5fa93df6e4d19.pdf
    • https://cdn-cms.f-static.net/uploads/4390081/normal_5f9276f79a16f.pdf
    • https://cdn-cms.f-static.net/uploads/4415937/normal_5f9a3ed1ec7c0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/caaeff35-fc96-4a75-8b80-6096f1f64e19/26149944160.pdf
    • https://s3.amazonaws.com/ninazarila/68419918306.pdf
    • https://uploads.strikinglycdn.com/files/b4c15ba7-9757-4034-aec3-4df712e1d966/96021413952.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a996.bin
cb3f37cf2201088c7e78b884fd0a81611908acec3d6570d2e145d7f020f9e14c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA996 5460 bytes
font_01_sfnt_off0000bc1f.bin
8f7a4a7640c4437f7c1349e2e691561733ac5fa548c6305798191a0e6d03230c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1F 9124 bytes

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