Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e32846e43bf677a…

MALICIOUS

PDF

90.2 KB Created: 2020-04-09 00:39:19 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 28b5140db946f5dd429567c98afef9ac SHA-1: 02d718d78af0092117d8edb1d856721c773da2ca SHA-256: 7e32846e43bf677a04f6e12d577a27e82ae1e3b303d5aacd9a07e7726120f3c9
104 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, http://extravirgincoffee.com/uploads/1/3/0/6/130622092/130622092.html#a+murderer%27s+guide+to+memorization+full+movie, is presented as a lure. The ML classifier strongly indicated maliciousness, and the presence of numerous external links is a common technique for distributing malicious content or for SEO abuse.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://extravirgincoffee.com/uploads/1/3/0/6/130622092/130622092.html#a+murderer%27s+guide+to+memorization+full+movie
    • http://asrforwarding.com/uploads/1/3/1/4/131437725/tesikevifobo.pdf
    • http://palmermack.com/uploads/1/3/0/7/130775665/a24cc.pdf
    • http://china-unlocked.com/uploads/1/3/0/4/130483285/e0c9e2cf74f27.pdf
    • http://elizabethleecunningham.com/uploads/1/3/0/5/130590363/9040529.pdf
    • http://avant-gardeinspections.com/uploads/1/3/0/6/130604113/rizitejaleru.pdf
    • http://donnacloudsalon.com/uploads/1/3/0/5/130589249/2631529.pdf
    • http://futurecitywny.org/uploads/1/3/0/9/130969997/folipatemu-xatinijatege-lafota-gomopetab.pdf
    • http://rackare.com/uploads/1/3/0/4/130490314/finuvozixowudi.pdf
    • http://thecarolekingteam.com/uploads/1/3/0/5/130589322/6364255.pdf
    • http://badjeeps.net/uploads/1/3/1/4/131408082/kifafo.pdf
    • http://balearicluxuryestates.com/uploads/1/3/0/4/130488165/ab1d293ed5.pdf
    • http://factsoverfiction.net/uploads/1/3/0/5/130545199/mimipuj.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013a51.bin
5945fc8c6e238ad8d634e1fdb59961ce1275f26a238887b116cdb84968f3d608		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A51 8692 bytes

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