Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1492f4c342461f1…

MALICIOUS

PDF

42.4 KB Created: 2020-04-18 12:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0c0fa19b14608bc3a0cf410337de7e19 SHA-1: 5a25a8f0201d935100f4d83917c07314d45c0d2c SHA-256: f1492f4c342461f1eaf5a229243815470960ba42c1bc1158d7436af91e56ed44
94 Risk Score

Malware Insights

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

The PDF file contains a link farm that redirects to multiple other PDF files hosted on various domains. The primary URL, http://iglootw.com/uploads/1/3/1/3/131383964/131383964.html#inflatable+backpack+frame+sheet, is presented as content related to an inflatable backpack frame sheet, likely a lure. The heuristic PDF_SEO_LINK_FARM indicates a mass of external links, suggesting a malicious intent to distribute further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://iglootw.com/uploads/1/3/1/3/131383964/131383964.html#inflatable+backpack+frame+sheet
    • http://fileyourownfbar.com/uploads/1/3/0/9/130969329/zepinu-wejifeku.pdf
    • http://socialbrews.com/uploads/1/3/0/6/130640063/nezivawi.pdf
    • http://tacwest.ca/uploads/1/3/0/6/130639676/3592720.pdf
    • http://sippsngiggles.com/uploads/1/3/0/6/130621952/6827640.pdf
    • http://liftingtheveils.com/uploads/1/3/0/5/130588806/nagokubiw-nopovikapasoled.pdf
    • http://csmx.info/uploads/1/3/1/3/131398134/zukuvugozikid-fubetikakowilek-xudur.pdf
    • http://russianfestival.org/uploads/1/3/0/6/130639855/cbfb3dc79009.pdf
    • http://brikonete-hfh55.com/uploads/1/3/0/5/130551302/muwekonono.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_off000073f3.bin
5b3710621ad0d774194d37a153aced3d3d3e64e0f98e9dbd57d0d4d1ce39d7ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73F3 7844 bytes
font_01_sfnt_off0000927d.bin
3bbda7b3b17b1987a96512e13a0a8feab57a28707129b34af62db9440b3e9efa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x927D 2648 bytes

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