Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dfb5350ce6e5da0…

MALICIOUS

PDF

45.3 KB Created: 2020-06-06 14:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84dc328600e2a0fdaeb2e75ed4527ffe SHA-1: 983f1b11f68b0e32a6018a0269c7884d7d4ed00e SHA-256: 0dfb5350ce6e5da0e11560335c64414985023a764d2408781227ef5c79f5b82d
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains a large number of external links, many of which are algorithmically generated and point to suspicious domains. The document body, though partially obfuscated, includes a URL that is part of this link farm, suggesting a social engineering tactic to trick users into clicking malicious links. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a link-based attack.

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://mingzhuyulechengxianjinbaijiale.br3h.com/uploads/1/3/0/6/130620511/130620511.html#principia+mathematica+1+1%253D2+pdf
    • http://4d.ee/uploads/1/3/0/5/130589362/bugogasovepasemi.pdf
    • http://brightbeginningseylc.com/uploads/1/3/0/6/130620295/xawunuroxosajax.pdf
    • http://webmail.davidhaziza.com/uploads/1/3/0/4/130488820/zidisidixuxafozizi.pdf
    • http://mingzhuyulechengxianjinbaijiale.br3h.com/uploads/1/3/0/6/130620511/terms.html
    • http://mingzhuyulechengxianjinbaijiale.br3h.com/uploads/1/3/0/6/130620511/dmca.html
    • http://mingzhuyulechengxianjinbaijiale.br3h.com/uploads/1/3/0/6/130620511/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://zofefovobize.files.wordpress.com/2020/06/11654273309.pdf
    • https://japilif.files.wordpress.com/2020/06/10158887282.pdf
    • https://zixofiliko.files.wordpress.com/2020/06/nasetotelosuj.pdf
    • https://xaludutalovu.files.wordpress.com/2020/06/jusafivunejanifonabufiz.pdf
    • https://wizubuvore.files.wordpress.com/2020/06/pigojam.pdf
    • https://tuvuwem.files.wordpress.com/2020/06/jakinujorazufeluvemebo.pdf
    • https://matuwakena.files.wordpress.com/2020/06/lepubujemosatawufobiguv.pdf
    • https://joruxetapuka.files.wordpress.com/2020/06/nuzinulituwulafugesodijo.pdf
    • https://juwukeduve.files.wordpress.com/2020/06/wiputabikojowek.pdf
    • https://rilamexix970799637.files.wordpress.com/2020/06/vujajiwumaxom.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://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000803c.bin
304d32a3c54f57da501b0cda4b766b3af99167de3df0f2754f60199130959981		 pdf-font-stream PDF embedded font (sfnt) at offset 0x803C 13244 bytes

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