Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c506ad3c79710f…

MALICIOUS

PDF

44.4 KB Created: 2020-04-27 19:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9fc1ff9bd1fc549776ed771134afab77 SHA-1: 3db1227bc6469318eb122aaceffc3bd3c98a8cb4 SHA-256: 71c506ad3c79710f57b452ad543ca430e3188ff5447c779e74092b03ac337fdd
136 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to other PDF files, suggesting a link farm designed to host malicious content. The ML classifier strongly indicated maliciousness. The presence of embedded URLs and the PDF_RANDOM_URL_LINK heuristic indicate attempts to redirect the user to potentially harmful external resources.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://rebeccalaplacaattia.com/uploads/1/3/1/3/131398004/131398004.html#accomplishment+report+on+clean+up+drive
    • http://richarddaviescelebrant.com/uploads/1/3/1/4/131437701/jaxozek_xitiduz.pdf
    • http://roofcleaningpp.com/uploads/1/3/1/4/131437671/newifog.pdf
    • http://homeexpresservices.com/uploads/1/3/0/5/130588410/mukelik.pdf
    • http://atouchofhomestaging.com/uploads/1/3/0/3/130323332/667479746b0c6e8.pdf
    • http://jllcapitalmarketslakepointecenter.com/uploads/1/3/0/5/130551184/1837451.pdf
    • http://haulinoatslogistics.com/uploads/1/3/0/8/130814774/lamedoxafif.pdf
    • http://ericlowther.ca/uploads/1/3/0/7/130775850/3602754.pdf
    • http://triviastickers.com/uploads/1/3/0/4/130478374/ab916dd5cf3b3d8.pdf
    • http://asianflushninja.com/uploads/1/3/0/6/130620574/tifup.pdf
    • http://wilkesbarrebouncehouse.com/uploads/1/3/0/2/130289630/xokamapowopi.pdf
    • http://socialmie.com/uploads/1/3/1/6/131607208/420bd7be1.pdf
    • http://jfwebdesign.ca/uploads/1/3/1/3/131380343/dusagi_lofixulewo_damaxiperabe.pdf
    • http://ddsfitnessandpt.com/uploads/1/3/0/2/130272603/591653.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_off000086ea.bin
884c1c1b11b29fbba89cbc04f359978dca56dfa44026601fc435a29a57b8e657		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86EA 7924 bytes

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