Malicious PDF — malware analysis report

Static analysis result for SHA-256 183f8dc3b45b053a…

MALICIOUS

PDF

44.3 KB Created: 2020-03-09 13:26:19 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: eaf3c989faffc3b18fb4b08c7bd3522a SHA-1: d07ee5cb4500c7032f6931b6ab7754e89db00230 SHA-256: 183f8dc3b45b053a271f21bdac5c10fd9ae722955c0af68e0461eea231dd08f1
96 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, identified by the PDF_SEO_LINK_FARM heuristic, which are likely intended to redirect users to malicious sites. The document body, though partially corrupted, suggests a lure related to a financial accounting manual. The ML classifier strongly indicates maliciousness, and the presence of external URIs points towards a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://tdz539.bdgct.com/uploads/1/3/0/6/130621867/130621867.html#financial+accounting+3+valix+solution+manual+2017
    • http://houstonsteinway.net/uploads/1/3/0/3/130313157/4371849.pdf
    • http://usafagapc.org/uploads/1/3/0/6/130620520/sajawak.pdf
    • http://74-123-78-248.mgwnet.com/uploads/1/3/0/5/130540664/4856788.pdf
    • http://physicalcultureproject.com/uploads/1/3/0/9/130969847/jadaxobija.pdf
    • http://iheartjuicing.com/uploads/1/3/0/7/130775842/11de58ace3a7b.pdf
    • http://goblinstory.com/uploads/1/3/0/6/130604340/sepobefujewo-dodopuluwevat-sevozenuga.pdf
    • http://www.ds.q8ti.net/uploads/1/3/0/6/130604741/81d7d490e15c53a.pdf
    • http://alopecian.com/uploads/1/3/0/5/130588550/3368260.pdf
    • http://mail.jarmdelboccio.com/uploads/1/3/0/8/130813514/lawatutom.pdf
    • http://qurantobible.co.uk/uploads/1/3/0/5/130588506/3468590.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_off00007fed.bin
44784392d1f60c30f14a093cd52e8c723dd20d32ee07c5b6ab58cf7ee6721cdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FED 9572 bytes

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