Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7763f5a11bd3767…

MALICIOUS

PDF

81.6 KB Created: 2020-11-25 16:34:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0ace4975b1ad035c2143642365641ef SHA-1: 1bf8d7ff45065d2086a028421286be688356fee7 SHA-256: d7763f5a11bd37676032fc74a93c6ee727b2b2eeaac9495650d8a7af88b150bb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to SEO-related content or potentially malicious sites, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_URI' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or spam campaign, likely leveraging embedded JavaScript for redirection or obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/strik?utm_term=pokemon+ranger+shadows+of+almia+characters
    • https://rereviraret.weebly.com/uploads/1/3/4/5/134512362/xadolazurare-rojurujadugijo.pdf
    • https://rajofike.weebly.com/uploads/1/3/4/5/134500595/pulaporadupudavu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sajezife/jukena.pdf
    • https://uploads.strikinglycdn.com/files/45edca90-fc19-4229-93c3-79a8648f0d2b/14234337154.pdf
    • https://uploads.strikinglycdn.com/files/353e72c0-8cd5-4235-a32c-cd9f782a2a84/mp3_akb48_fortune_cookie.pdf
    • https://uploads.strikinglycdn.com/files/c9f20692-2963-480c-b948-c1089188c47e/24117329164.pdf
    • https://uploads.strikinglycdn.com/files/471f820e-48d5-4178-a05a-ef0311410c08/58914297387.pdf
    • https://uploads.strikinglycdn.com/files/3b58535a-2ff6-4c3e-a821-f257ea80bd32/24777023819.pdf
    • https://s3.amazonaws.com/dabatisew/buxetelavuwubobowuzuwiz.pdf
    • https://uploads.strikinglycdn.com/files/5397c17a-9549-4671-bb43-b46e7016e082/67367809919.pdf
    • https://s3.amazonaws.com/lezopobigeza/clinician-_administered_ptsd_scale_caps-_5.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd59.bin
094e40ecba1f4f7c092b441e81370e55a7fc0d608056a66e1403ee15345e5756		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD59 3556 bytes
font_01_sfnt_off0000ea0c.bin
83b11d3f1224ae3441f7cd63e983f5cc2ba33ec021e8b1b571c6d8fd9ef29e9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0C 5592 bytes
font_02_sfnt_off0000fd02.bin
50133959d6dbe18ffd33f5b3e7631016e80d98653f99f74ffd7a03e1b0f65010		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD02 12096 bytes
font_03_sfnt_off00012442.bin
e378496ff4b4329e9698dc62510b77aa20d6148e4879fbbc576c593c8f820d6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12442 16060 bytes

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