Malicious PDF — malware analysis report

Static analysis result for SHA-256 3affb0e2025dcca0…

MALICIOUS

PDF

100.3 KB Created: 2021-03-19 08:34:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5c30c07fa02ca9aece2b9251f5291fa SHA-1: ba2dc5fcf364f9f08ee42f969e1145e2f4a83cbf SHA-256: 3affb0e2025dcca0e521bcc1e80731db29a687eb94815452d8ac9d3e1d34843d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, likely to a link farm, and one of the embedded URIs points to 'nipisod.ru'. The document body, though partially corrupted, contains text related to stock market holidays, which is likely a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://nipisod.ru/strik?utm_term=stock+market+holidays+2020+december
    • https://lebugaboforov.weebly.com/uploads/1/3/5/9/135976333/1372514.pdf
    • https://static.s123-cdn-static.com/uploads/4471082/normal_5ffb82cd80c67.pdf
    • https://jizotigop.weebly.com/uploads/1/3/0/8/130874082/aa2b6a.pdf
    • https://tidosivapozagul.weebly.com/uploads/1/3/4/3/134390518/mukoxubozivujon.pdf
    • https://wuvonavozaf.weebly.com/uploads/1/3/2/6/132695620/vewogeletena.pdf
    • https://bozixezexa.weebly.com/uploads/1/3/4/8/134861503/3638445.pdf
    • https://radebijudowax.weebly.com/uploads/1/3/1/6/131607027/6006745.pdf
    • https://setopotuvojinow.weebly.com/uploads/1/3/4/8/134877086/demirivili_girozuxujujedez.pdf
    • https://zitobejamowimuk.weebly.com/uploads/1/3/4/6/134623616/sixojamo.pdf
    • https://nidiladidubupa.weebly.com/uploads/1/3/4/7/134753920/jejipex.pdf
    • https://nopiwevupemaro.weebly.com/uploads/1/3/4/6/134653234/4410641.pdf
    • https://vedemolo.weebly.com/uploads/1/3/4/7/134702866/918365.pdf
    • https://cdn-cms.f-static.net/uploads/4495240/normal_600f9f53ad552.pdf
    • https://mozevosiku.weebly.com/uploads/1/3/3/9/133999333/xorifononi-lafupuwak-sobabadogudena.pdf
    • https://cdn-cms.f-static.net/uploads/4403264/normal_601e61e6e57e6.pdf
    • https://vimixomi.weebly.com/uploads/1/3/4/8/134885651/5cd7125ca90ef70.pdf
    • https://givolejemaxo.weebly.com/uploads/1/3/5/3/135345859/9079646.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000139ae.bin
8905969279e69ad86382df44e81777713baa9051edfab6a3319edc9faa3137c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139AE 5544 bytes
font_01_sfnt_off00014c70.bin
44f601b70b40d46bbc803d58aeb3beca3860cbc6f3002b472aa1f9307bb3babc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C70 12136 bytes
font_02_sfnt_off000175a2.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x175A2 4324 bytes

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