Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c326c735806cccb…

MALICIOUS

PDF

35.6 KB Created: 2020-04-08 11:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 309ff95510e25a0062c39c6ac6ab19fd SHA-1: 1925a7946f60e1fa8f943439842e7e13d6915da2 SHA-256: 7c326c735806cccbe8d900a5adedf46998292f6885b127986c24741487664097
136 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 PDFs hosted on similar domains, suggesting a link farm or redirection mechanism. The ML classifier strongly indicated maliciousness, and the presence of numerous external URLs points towards a phishing or malware distribution attempt. No scripts were extracted, but the structure suggests a spearphishing attachment designed to lead users to potentially malicious external content.

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://thevictoriapaige.com/uploads/1/3/0/5/130541064/130541064.html#electron+configuration+of+al+3++ion
    • http://mooregoodhairdays.com/uploads/1/3/0/4/130488833/6b5ebabdf92.pdf
    • http://francontabil.com/uploads/1/3/0/4/130475990/rivowibedub.pdf
    • http://eastbaypsychotherapycollaborative.org/uploads/1/3/1/3/131398088/f6c64c3a3c0429.pdf
    • http://mratutor.com/uploads/1/3/0/4/130435893/8339487.pdf
    • http://mydanielswaterfront.com/uploads/1/3/0/6/130605084/tujodonolig-burir-mawedidapufoja.pdf
    • http://chestertonvalleygolfclub.com/uploads/1/3/1/3/131398143/9047147.pdf
    • http://sethspartanempire.com/uploads/1/3/0/2/130288320/5398175.pdf
    • http://designresolution.net/uploads/1/3/1/3/131398348/c5c56d2ba509.pdf
    • http://psychastar.com/uploads/1/3/0/5/130551486/2344357.pdf
    • http://botoxforbreastcancer.com/uploads/1/3/0/4/130435611/vitodukiwexebo_vedinuboda.pdf
    • http://mini-thoughts.com/uploads/1/3/0/7/130739740/kamirofofidisevaj.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://www.adobe.com/).Noto
    • http://www.google.com/get/noto/http://www.adobe.com/type/This
    • http://scripts.sil.org/OFLNoto

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000581d.bin
1b33b36330493055a73a4ca9090c63eb2b81a17a504e870f2998e8231c4e6996
pdf-font-stream PDF embedded font (sfnt) at offset 0x581D 7192 bytes
font_01_sfnt_off00007467.bin
885781ec91db75dc8c4a6a3d3dac0324bdfdb8f2239dab70466c62035ae072da
pdf-font-stream PDF embedded font (sfnt) at offset 0x7467 4144 bytes