Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5676ded69f13571…

MALICIOUS

PDF

40.4 KB Created: 2020-06-11 16:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 154c3bfe0caba663b307776ddaaaa42b SHA-1: 5494eeae3151c555eb1d33f930da11b81a40c404 SHA-256: d5676ded69f1357107663961c044713ab58e0fed467427ca3593787114076c1a
94 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, contains text related to 'debit note' and 'tally erp 9 pdf', suggesting a lure for financial or accounting-related information. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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 http://basemarkbiz.com/uploads/1/3/0/4/130435947/130435947.html#debit+note+in+tally+erp+9+pdf
    • http://mail.6lnkshop.com/uploads/1/3/0/5/130539099/45915.pdf
    • http://mail.rootcellargardens.com/uploads/1/3/0/5/130588203/9458802.pdf
    • http://catherinegreer.com/uploads/1/3/1/0/131070841/76c7b2b11cb6b.pdf
    • http://ccaromatherapy.com/uploads/1/3/1/0/131070309/pavegel.pdf
    • http://627.heathermcclarriephotography.com/uploads/1/3/0/3/130379523/3919556.pdf
    • http://74-123-73-221.mgwnet.com/uploads/1/3/1/6/131636833/vuromifob_nigajomoxune_gifubasufu_xuwenufulorekil.pdf
    • http://mx.bluegrassperformanceinvitational.com/uploads/1/3/1/4/131406118/8675698.pdf
    • http://beautybyav30.com/uploads/1/3/0/5/130589132/rajegelitukova-pazeboj-lufenewilejika.pdf
    • http://thefrosteddoughnut.com/uploads/1/3/0/6/130621158/9faa1d257c6b3f.pdf
    • http://mybraincoach.org/uploads/1/3/0/8/130873741/dimebitide-najixunaval-togox.pdf
    • https://jurikebigox883042776.files.wordpress.com/2020/06/98320595811.pdf
    • https://wajojewo.files.wordpress.com/2020/06/guwalife.pdf
    • https://nixalomitu.files.wordpress.com/2020/06/74903413281.pdf
    • https://xipabasu.files.wordpress.com/2020/06/sikazabo.pdf
    • https://kejaram.files.wordpress.com/2020/06/385941565.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005da6.bin
10d82676cf5341679ff6b7bc13202749bdac2762173a617a4cbd00ff99ff5489		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DA6 10236 bytes
font_01_sfnt_off000080d4.bin
ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80D4 16164 bytes

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