Malicious PDF — malware analysis report

Static analysis result for SHA-256 6086ec676c8f8e1f…

MALICIOUS

PDF

44.9 KB Created: 2020-04-21 18:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b0d20d04312340011e5c238759017284 SHA-1: cd9921d39ea1815bfc10a3af2aacc85ff51ee1e9 SHA-256: 6086ec676c8f8e1f62b6e26cf7dae4ad9f7c2f9f3b00607f153bc02f310c794b
104 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are structured as a link farm, suggesting an attempt to distribute malicious content. The document body, though heavily obfuscated, contains a URL that appears to be a lure for exam answers, aligning with the PDF_SEO_LINK_FARM heuristic. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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
  • 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://itsagreatdaytofeelbeautiful.shop/uploads/1/3/0/3/130313252/130313252.html#kcet+2018+maths+answer+key+g
    • http://blackribbonseasonings.com/uploads/1/3/0/2/130289214/pasopazage.pdf
    • http://christianbebrave.org/uploads/1/3/0/2/130272390/dutas-fipav-norusufa.pdf
    • http://economyrollershades.com/uploads/1/3/0/8/130815140/6660405.pdf
    • http://communicationcasesrobina.info/uploads/1/3/0/7/130739674/9cc2971e4832.pdf
    • http://cornerstoneaccountants.com/uploads/1/3/1/0/131070115/juvigitavozebin.pdf
    • http://addisongates.com/uploads/1/3/0/7/130776810/6634242.pdf
    • http://myroofingorlando.com/uploads/1/3/0/7/130775644/wopinixo-gazanek.pdf
    • http://skyefcameron.com/uploads/1/3/1/0/131070861/fded1e728bccf3.pdf
    • http://gypsylogic.com/uploads/1/3/0/5/130589217/349595882d3.pdf
    • http://lasinrival.net/uploads/1/3/0/5/130588389/besefut_wufefavivax.pdf
    • http://mymcdougalbenefits.com/uploads/1/3/1/3/131398101/divawalavubadu-limugujadawot-sonizonowapu.pdf
    • http://endofbench.com/uploads/1/3/0/3/130323754/6217358.pdf
    • http://lifeingramercypark.com/uploads/1/3/0/6/130622042/91c87b8a52.pdf
    • http://carterandcompanybroker.com/uploads/1/3/1/3/131397983/golegel_fewez_vasezuvufoviv_goritaminoju.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007bbc.bin
7ab7594fe9a73a836c7d7b00eb478d6109806ce7373fedb0ce2ff5730b8b8c85
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BBC 8900 bytes
font_01_sfnt_off00009d99.bin
41d5c9cb4d60b7530e3cfd93a78efd430fe179aa57a8296e74fb8a971da4b0ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D99 2600 bytes