PDF malware analysis — malicious · 1896718fcd60e0ec

MALICIOUS

PDF

35.7 KB Created: 2020-06-20 12:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 516ceb41ab82ee999b242c70ebd3420e SHA-1: 76227a9c0dd7501eed55b606020ac2659ca8a95a SHA-256: 1896718fcd60e0ecafd05997e75d4f082fd6ecf2d7933d5e6a311eef499715da

136 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a lure for "British pharmacopoeia free download pdf" and links to a large number of external PDF files hosted on various domains, indicating a link farm for SEO manipulation. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links suggests an attempt to redirect users to malicious content. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution scheme.

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://m.statixhair.com/uploads/1/3/1/8/131857602/131857602.html#british+pharmacopoeia+free+download+pdf
- http://myswagbag.org/uploads/1/3/0/3/130379118/nalixe-voxofif-watoba-jokatid.pdf
- http://lifestyleasmedicine.com/uploads/1/3/0/7/130739552/6257632.pdf
- http://tpccpa.com/uploads/1/3/0/7/130739883/d12cda10748.pdf
- http://spsmgmtproposal.com/uploads/1/3/1/3/131383594/jonazaju.pdf
- http://theoriginalpancakehousesavannah.com/uploads/1/3/0/5/130550938/6282186.pdf
- http://globalnationalfunding.com/uploads/1/3/0/9/130969411/2440354.pdf
- http://moonlightled.ca/uploads/1/3/0/2/130271030/bd61e8c3ec.pdf
- http://mail.speluqueros.com/uploads/1/3/0/5/130550910/87509f0f841.pdf
- http://wyattrealtor.com/uploads/1/3/0/7/130740618/rulabibewasemuk.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- 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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000467f.bin` `70bfee15dc5bd7b5478adf572305aa246c05edbb7cd42246c602650eb69718db`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x467F	5324 bytes
`font_01_sfnt_off0000587c.bin` `6f735a77811c5b19b42c63be26d190f068a64305389be492dbc98af80eafa8b4`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x587C	15788 bytes

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