Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ae220051eb5b2f7…

MALICIOUS

PDF

43.9 KB Created: 2020-04-04 16:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fc160a3c433d1f990e059667e2d53b2a SHA-1: 75865730263bd687d8748e04b489c60f8bd315f2 SHA-256: 0ae220051eb5b2f7bdd1de1a0e184646039aceff3b560fce4474824b701b3f58
176 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files hosted on similar domains, indicating a link farm designed to distribute malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests that the document may also instruct the user to open a password-protected archive, a common tactic to bypass security scanners. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ttmusb.com/uploads/1/3/0/4/130489377/130489377.html#que+es+un+mapa+y+sus+elementos
    • http://babysfirststories.com/uploads/1/3/0/4/130488265/59f83a33.pdf
    • http://zopcandyco.com/uploads/1/3/0/7/130738550/4531526.pdf
    • http://3d-knowledge.com/uploads/1/3/0/6/130604551/6212363.pdf
    • http://nicolasvaradi.com/uploads/1/3/1/4/131437987/ae5f1d.pdf
    • http://exlibrisverbatim.com/uploads/1/3/0/2/130288761/vekigivuf.pdf
    • http://2020laurenbrunsvold.com/uploads/1/3/1/3/131383333/xulase-ganisunetejovas-valulumejarapaj.pdf
    • http://fudgemylife.net/uploads/1/3/1/1/131164399/1feba337.pdf
    • http://carrollcountydentistry.com/uploads/1/3/0/2/130271148/015eeb801a77.pdf
    • http://azamericansaddlebredfoundation.org/uploads/1/3/0/7/130739934/panewujulanos_fekuxone_guwetobivaja_gonox.pdf
    • http://roselegalphotography.com/uploads/1/3/0/2/130270987/9716215.pdf
    • http://drjamesworling.net/uploads/1/3/1/3/131380121/noriwon_sixepa.pdf
    • http://douxoverdesign.com/uploads/1/3/0/8/130814225/vobopesesi-senajoreleraju-komofavebusufis.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006de9.bin
780c75a136f695e0b3e41df63a71021d19d42db110aec5886b890673038b9681		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE9 8244 bytes
font_01_sfnt_off00008c26.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C26 16036 bytes

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