Malicious PDF — malware analysis report

Static analysis result for SHA-256 643daa17b8bce63f…

MALICIOUS

PDF

37.8 KB Created: 2020-04-03 15:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4d51790605c5db99d15a7c37ceb54d10 SHA-1: e86adf658b1e1a2aef1f652462a193a63c42dc7a SHA-256: 643daa17b8bce63f8acd3e80ad75372b38be8974c2d800317071972f5015e514
136 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to algorithmically generated URLs on various domains. The document body, though partially corrupted, contains a reference to a Honeywell thermostat, suggesting a potential lure. The primary attack pattern involves directing users to a link farm of SEO-optimized PDF documents, likely to serve as a redirection mechanism for malicious content or phishing pages. No scripts were extracted, but the PDF structure itself facilitates the 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://meredithbirrell.com/uploads/1/3/0/4/130477131/130477131.html#honeywell+rth7500d+conventional+7-day+programmable+thermostat
    • http://lightupau.com/uploads/1/3/0/4/130483050/2662859.pdf
    • http://lianafaith.net/uploads/1/3/0/3/130323900/1e7a5.pdf
    • http://libertypoolclean.com/uploads/1/3/0/6/130639554/nudikuxivenow-genenejasum-kalul-karofaza.pdf
    • http://niakohimura.com/uploads/1/3/0/5/130545882/8877597.pdf
    • http://ardmore-carryout.com/uploads/1/3/0/3/130379067/nawarimu.pdf
    • http://inner-bonding.com/uploads/1/3/0/7/130740609/f24c1d.pdf
    • http://bellinfischer.de/uploads/1/3/0/4/130490399/poravudifoniwe_nexakepaxe_gukujaxadarukuz_gegolureruv.pdf
    • http://charlestonlowcountrymarinesurvey.biz/uploads/1/3/0/6/130639251/suberezixem.pdf
    • http://redsea-rentals.com/uploads/1/3/0/6/130603824/zevabexakozov_zisumegoxefo.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_off00006b0f.bin
4338c83c1db74490e61964f96321021f2a97a99b6b5ab0b61033951892e035f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B0F 7992 bytes

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